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SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 --------------- Schedule 13G (Rule 13d-102) INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b) (c), AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO RULE 13d-2(b) (Amendment No. 1)(1) Gentle Dental Service Corporation - -------------------------------------------------------------------------------- (Name of Issuer) Common Stock - -------------------------------------------------------------------------------- (Title of Class of Securities) 37245B102 - -------------------------------------------------------------------------------- (CUSIP Number) June 3, 1998 - -------------------------------------------------------------------------------- (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [ ] Rule 13d-1 (b) [X] Rule 13d-1 (c) [ ] Rule 13d-1 (d) (1) The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page. The information required on the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). Page 1 of 20 Pages

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 2 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel V L.P. ("AV") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 656,283 shares (including 422,914 shares of outstanding Common Stock, BENEFICIALLY 58,342 shares of Common Stock issuable upon conversion of Series D OWNED BY EACH Preferred Stock, and 175,027 shares issuable upon conversion of the REPORTING principal amount of convertible debentures), except that AV Assoc., the PERSON general partner of AV, and Breyer, Evnin, Hill, Patterson, Sednaoui, WITH Swartz, ACPFP, JWBT, SFP and Wagner, the managing members of AV Assoc., may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 656,283 shares (including 422,914 shares of outstanding Common Stock, 58,342 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 175,027 shares issuable upon conversion of the principal amount of convertible debentures), except that AV Assoc., the general partner of AV, and Breyer, Evnin, Hill, Patterson, Sednaoui, Swartz, ACPFP, JWBT, SFP and Wagner, the managing members of AV Assoc., may be deemed to have shared dispositive power with respect to such shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 656,283 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 8.10% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 3 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel Internet/Strategic Technology Fund L.P. ("AISTF") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 87,938 shares (including 56,669 shares of outstanding Common Stock, BENEFICIALLY 7,817 shares of Common Stock issuable upon conversion of Series D OWNED BY EACH Preferred Stock, and 23,452 shares issuable upon conversion of the REPORTING principal amount of convertible debentures), except that AISTF Assoc., PERSON the general partner of AISTF, and Breyer, Evnin, Hill, Patterson, WITH Sednaoui, Swartz, ACPFP, SFP and Wagner, the managing members of AISTF Assoc., may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 0 shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 87,938 shares (including 56,669 shares of outstanding Common Stock, 7,817 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 23,452 shares issuable upon conversion of the principal amount of convertible debentures), except that AISTF Assoc., the general partner of AISTF, and Breyer, Evnin, Hill, Patterson, Sednaoui, Swartz, ACPFP, SFP and Wagner, the managing members of AISTF Assoc., may be deemed to have shared dispositive power with respect to such shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 0 shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 87,938 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.11% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 4 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel Keiretsu V L.P. ("AKV") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 13,027 shares (including 8,395 shares of outstanding Common Stock, BENEFICIALLY 1,158 shares of Common Stock issuable upon conversion of Series D OWNED BY EACH Preferred Stock, and 3,474 shares issuable upon conversion of the REPORTING principal amount of convertible debentures), except that AKV Assoc., PERSON the general partner of AKV and Breyer, Evnin, Hill, Patterson, WITH Sednaoui, Swartz and Wagner, managing members of AKV Assoc., may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER See response to row 5. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 13,027 shares (including 8,395 shares of outstanding Common Stock, 1,158 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 3,474 shares issuable upon conversion of the principal amount of convertible debentures), except that AKV Assoc., the general partner of AKV and Breyer, Evnin, Hill, Patterson, Sednaoui, Swartz and Wagner, managing members of AKV Assoc., may be deemed to have shared dispositive power with respect to such shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER See response to row 7. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,027 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.17% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 5 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel Investors `96 L.P. ("AI96") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 39,083 shares (including 25,186 shares of outstanding Common Stock, BENEFICIALLY 3,474 shares of Common Stock issuable upon conversion of Series D OWNED BY EACH Preferred Stock, and 10,423 shares issuable upon conversion of the REPORTING principal amount of convertible debentures), except that Breyer, Evnin, PERSON Hill, Patterson, Sednaoui, Swartz and Wagner, the general partners of WITH AI96, may be deemed to have shared voting powers with respect to such shares. -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER See response to row 5. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 39,083 shares (including 25,186 shares of outstanding Common Stock, 3,474 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 10,423 shares issuable upon conversion of the principal amount of convertible debentures), except that Breyer, Evnin, Hill, Patterson, Sednaoui, Swartz and Wagner, the general partners of AI96, may be deemed to have shared dispositive powers with respect to such shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER See response to row 7. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 39,083 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.50% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 6 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel V Associates L.L.C. ("AV Assoc.") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 656,283 shares (including 422,914 shares of outstanding Common Stock, PERSON 58,342 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 175,027 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AV. AV Assoc. is the general partner of AV, and may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 656,283 shares (including 422,914 shares of outstanding Common Stock, 58,342 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 175,027 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AV. AV Assoc. is the general partner of AV, and may be deemed to have shared dispositive power with respect to such shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 656,283 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 8.10% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 7 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel Keiretsu V Associates L.L.C. ("AKV Assoc.") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH6 SHARED VOTING POWER REPORTING 13,027 shares (including 8,395 shares of outstanding Common Stock, PERSON 1,158 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 3,474 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AKV. AKV Assoc. is the general partner of AKV, and may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 13,027 shares (including 8,395 shares of outstanding Common Stock, 1,158 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 3,474 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AKV. AKV Assoc. is the general partner of AKV, and may be deemed to have shared dispositive power with respect to such shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,027 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 0.17% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 8 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Accel Internet/Strategic Technology Fund Associates L.L.C. ("AISTF Assoc.") Tax ID Number: - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 87,938 shares (including 56,669 shares of outstanding Common Stock, PERSON 7,817 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 23,452 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AISTF. AISTF Assoc. is the general partner of AISTF, and may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 87,938 shares (including 56,669 shares of outstanding Common Stock, 7,817 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 23,452 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AISTF. AISTF Assoc. is the general partner of AISTF, and may be deemed to have shared dispositive power with respect to such shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 87,938 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 1.11% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 9 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) ACP Family Partnership L.P. ("ACPFP") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION California - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 744,221 shares (including 479,583 shares of outstanding Common Stock, PERSON 66,159 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 198,479 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 shares are directly owned by AV and 87,938 shares are directly owned by AISTF. ACPFP may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE VOTING POWER 0 shares -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 744,221 shares (including 479,583 shares of outstanding Common Stock, 66,159 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 198,479 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 shares are directly owned by AV and 87,938 shares are directly owned by AISTF. ACPFP may be deemed to have shared dispositive power with respect to such shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 744,221 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.15% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 10 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Swartz Family Partnership L.P. ("SFP") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Delaware - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 744,221 shares (including 479,583 shares of outstanding Common Stock, PERSON 66,159 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 198,479 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 shares are directly owned by AV and 87,938 shares are directly owned by AISTF. SFP may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 744,221 shares (including 479,583 shares of outstanding Common Stock, 66,159 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 198,479 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 shares are directly owned by AV and 87,938 shares are directly owned by AISTF. SFP may be deemed to have shared dispositive power with respect to such shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 744,221 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.15% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* PN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 11 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) The Breyer 1995 Trust dated 10/4/95 ("JWBT") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION California - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 656,283 shares (including 422,914 shares of outstanding Common Stock, PERSON 58,342 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 175,027 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AV. JWBT may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 656,283 shares (including 422,914 shares of outstanding Common Stock, 58,342 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 175,027 shares issuable upon conversion of the principal amount of convertible debentures), which shares are directly owned by AV. JWBT may be deemed to have shared dispositive power with respect to such shares. - ----------------------------------- -------- ----------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 656,283 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 8.10% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* OO - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 12 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) James W. Breyer ("Breyer") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 796,331 shares (including 513,164 shares of outstanding Common Stock, PERSON 70,791 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Breyer may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Breyer may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 796,331 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.77% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 13 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Luke B. Evnin ("Evnin") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 796,331 shares (including 513,164 shares of outstanding Common Stock, PERSON 70,791 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Evnin may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Evnin may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 796,331 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.77% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 14 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Eugene D. Hill, III ("Hill") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 796,331 shares (including 513,164 shares of outstanding Common Stock, PERSON 70,791 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Hill may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Hill may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 796,331 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.77% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 15 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) Arthur C. Patterson ("Patterson") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 17,913 shares (including 11,544 shares of outstanding Common Stock, BENEFICIALLY 1,592 shares of Common Stock issuable upon conversion of Series D OWNED BY EACH Preferred Stock, and 4,777 shares of Common Stock issuable upon REPORTING conversion of the principal amount of convertible debentures) directly PERSON owned by Ellmore C. Patterson Partners ("ECPP"). Patterson is the WITH general partner of ECPP and may be deemed to have sole voting power with respect to such shares. -------- ----------------------------------------------------------------------- 6 SHARED VOTING POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Patterson may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 17,913 shares (including 11,544 shares of outstanding Common Stock, 1,592 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 4,777 shares of Common Stock issuable upon conversion of the principal amount of convertible debentures) directly owned by Ellmore C. Patterson Partners ("ECPP"). Patterson is the general partner of ECPP and may be deemed to have sole dispositive power with respect to such shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Patterson may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 814,244 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.98% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 16 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) G. Carter Sednaoui ("Sednaoui") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 796,331 shares (including 513,164 shares of outstanding Common Stock, PERSON 70,791 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Sednaoui may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Sednaoui may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 796,331 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.77% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 17 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) James R. Swartz ("Swartz") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 796,331 shares (including 513,164 shares of outstanding Common Stock, PERSON 70,791 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Swartz may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Swartz may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 796,331 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.77% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

- -------------------------------------------------------- --------------------------------------- CUSIP NO. 37245B102 13 G Page 18 of 20 Pages - -------------------------------------------------------- --------------------------------------- - ----------- -------------------------------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSONS I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY) J. Peter Wagner ("Wagner") - ----------- -------------------------------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ] (b) [X] - ----------- -------------------------------------------------------------------------------------------------------- 3 SEC USE ONLY - ----------- -------------------------------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION U.S. Citizen - ----------- -------------------------------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 0 shares BENEFICIALLY -------- ----------------------------------------------------------------------- OWNED BY EACH 6 SHARED VOTING POWER REPORTING 796,331 shares (including 513,164 shares of outstanding Common Stock, PERSON 70,791 shares of Common Stock issuable upon conversion of Series D WITH Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Wagner may be deemed to have shared voting power with respect to such shares. -------- ----------------------------------------------------------------------- 7 SOLE DISPOSITIVE POWER 0 shares. -------- ----------------------------------------------------------------------- 8 SHARED DISPOSITIVE POWER 796,331 shares (including 513,164 shares of outstanding Common Stock, 70,791 shares of Common Stock issuable upon conversion of Series D Preferred Stock, and 212,376 shares issuable upon conversion of the principal amount of convertible debentures), of which 656,283 are shares directly owned by AV, 87,938 are shares directly owned by AISTF, 13,027 are shares directly owned by AKV and 39,083 are shares directly owned by AI96. Wagner may be deemed to have shared dispositive power with respect to such shares. - ----------- -------------------------------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 796,331 - ----------- -------------------------------------------------------------------------------------------------------- 10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES* [ ] - ----------- -------------------------------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9 9.77% - ----------- -------------------------------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON* IN - ----------- -------------------------------------------------------------------------------------------------------- * SEE INSTRUCTIONS BEFORE FILLING OUT!

Page 19 of 20 This Amendment No. 1 amends the original Statement on 13G dated as of February 13, 1998 and filed by the certain of the Reporting Persons pursuant to Rule 13d-1(d) (the "Original Statement"). In connection with the purchase of certain Series D Preferred Stock and Convertible Debentures on June 3, 1998, the Reporting Persons are filing this Amendment No. 1 to reflect a change in filing status from Rule 13d-1(d) to Rule 13d-1(c). Only those Items as to which there has been a change of information are included in this Amendment. ITEM 2(a) Name of Persons Filing: Item 2(a) of the Original Statement is hereby amended to add J. Peter Wagner ("Wagner") to the list of Reporting Persons. ITEM 2(c) Citizenship: Item 2(c) of the Original Statement is hereby amended to specify that Wagner is a United States citizen. ITEM 4 OWNERSHIP: Item 4 of the Original Statement is hereby amended to specify that the ownership information provided in this Amendment No. 1 is as of June 3, 1998. ITEM 10. CERTIFICATIONS: By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect. Page 20 of 20 SIGNATURES After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Dated: June 12, 1998 Entities: Accel V L.P. Accel Internet/Strategic Technology Fund L.P. Accel Keiretsu V L.P. Accel Investors '96 L.P. Accel V Associates L.L.C. Accel Keiretsu V Associates L.L.C. Accel Internet/Strategic Technology Fund Associates L.L.C. ACP Family Partnership L.P. By: /s/ G. Carter Sednaoui The Breyer 1995 Trust dated 10/4/95 ------------------------------ Swartz Family Partnership L.P. G. Carter Sednaoui, as general partner or managing member or as Attorney-in-fact for above-listed entities Individuals: James W. Breyer Luke B. Evnin Eugene D. Hill, III Arthur C. Patterson G. Carter Sednaoui James R. Swartz By: /s/ G. Carter Sednaoui ------------------------------ G. Carter Sednaoui, Individually and as Attorney-in-fact for above-listed individuals By: /s/ J. Peter Wagner ------------------------------ J. Peter Wagner, Individually