HYBRID NETWORKS INC
SC 13D, 2000-05-25
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                                  Page 1 of 27


                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13D

                                 (RULE 13d-101)

                 INFORMATION TO BE INCLUDED IN STATEMENTS FILED
                    PURSUANT TO RULE 13D-1(a) AND AMENDMENTS
                     THERETO FILED PURSUANT TO RULE 13D-2(a)




                              HYBRID NETWORKS, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                    Common Stock, $0.001 Par Value Per Share

- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    44860K102

- --------------------------------------------------------------------------------
                                 (CUSIP Number)


            Carter Sednaoui                  Linda B. Daley, Esq.
             Accel Partners                Gunderson Dettmer Stough
           428 University Ave.        Villeneuve Franklin & Hachigian, LLP
           Palo Alto, CA  94301             155 Constitution Drive
                                           Menlo Park, CA 94025
                                             (650) 321-2400

- --------------------------------------------------------------------------------
       (Name, Address and Telephone Number of Person Authorized to Receive
                          Notices and Communications)


                                  December 1999
- --------------------------------------------------------------------------------
             (Date of Event which Requires Filing of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this schedule because of Rule 13d-1(e),  13d-1(f) or 13d-1(g),  check the
following box /x/.

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 (the "Act") or otherwise  subject to the liabilities of that section of the
Act but shall be subject to all other provisions of the Act.

                                      -1-

<PAGE>

                                  Page 2 of 27

<TABLE>
<CAPTION>

                                  SCHEDULE 13D

- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel IV, L.P.
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER                  988,712  shares,  except that Accel IV  Associates  L.P.  ("A4A"),  the general
                                      partner  of A4,  may be deemed to have sole  power to vote  these  shares,  and
                                      Swartz Family  Partnership L.P. ("SFP"),  James W. Breyer  ("Breyer"),  Luke B.
                                      Evnin  ("Evnin"),   Eugene  D.  Hill,  III  ("Hill"),   Paul  H.   Klingenstein
                                      ("Klingenstein"),   Arthur  C.  Patterson  ("Patterson"),  G.  Carter  Sednaoui
                                      ("Sednaoui") and James R. Swartz  ("Swartz"),  the general partners of A4A, may
                                      be deemed to have shared power to vote these shares.
                OF            -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
             REPORTING                988,712  shares,  except that A4A, the general  partner of A4, may be deemed to
                                      have sole power to dispose  of these  shares,  and SFP,  Breyer,  Evnin,  Hill,
                                      Klingenstein,  Patterson, Sednaoui and Swartz, the general partners of A4A, may
                                      be deemed to have shared power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           988,712

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           9.3%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>

                                  Page 3 of 27

<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel IV Associates L.P. ("A4A")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    988,712 shares,  all of which are directly owned by Accel IV L.P. ("A4").  A4A,
                                      the  general  partner  of A4,  may be deemed to have sole  power to vote  these
                                      shares, and Swartz Family Partnership L.P. ("SFP"), James W. Breyer ("Breyer"),
                                      Luke B. Evnin  ("Evnin"),  Eugene D. Hill, III ("Hill"),  Paul H.  Klingenstein
                                      ("Klingenstein"),   Arthur  C.  Patterson  ("Patterson"),  G.  Carter  Sednaoui
                                      ("Sednaoui") and James R. Swartz  ("Swartz"),  the general partners of A4A, may
                                      be deemed to have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 988,712 shares, all of which are directly owned by A4. A4A, the general partner
                                      of A4, and SFP, the general partner of A4A, may be deemed to have sole power to
                                      dispose of these shares, and SFP, Breyer, Evnin, Hill, Klingenstein, Patterson,
                                      Sednaoui and Swartz,  the general partners of A4A, may be deemed to have shared
                                      power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           988,712

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           9.3%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


                                      -3-


<PAGE>
                                                    Page 4 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel Keiretsu L.P. ("AK")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    20,511  shares,  except that Accel  Partners & Co. Inc.  ("AP&C"),  the general
                                      partner of AK, may be deemed to have sole power to vote these shares, and James
                                      W. Breyer  ("Breyer"),  Luke B. Evnin ("Evnin"),  Eugene D. Hill, III ("Hill"),
                                      Arthur C. Patterson  ("Patterson"),  G. Carter Sednaoui ("Sednaoui ") and James
                                      R. Swartz ("Swartz"),  the officers of AP&C, may be deemed to have shared power
                                      to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 20,511 shares,  except that AP&C,  the general  partner of AK, may be deemed to
                                      have sole power to dispose of these shares, and Breyer, Evnin, Hill, Patterson,
                                      Sednaoui and Swartz,  the officers of AP&C,  may be deemed to have shared power
                                      to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           20,511

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           less than 5%
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>
                                                    Page 5 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel Partners & Co. Inc. ("AP&C")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    20,511 shares,  all of which are directly owned by Accel Keiretsu L.P.  ("AK").
                                      AP&C, the general partner of AK, may be deemed to have sole power to vote these
                                      shares,  and James W. Breyer  ("Breyer"),  Luke B. Evnin  ("Evnin"),  Eugene D.
                                      Hill,  III ("Hill"),  Arthur C.  Patterson  ("Patterson"),  G. Carter  Sednaoui
                                      ("Sednaoui  ") and James R. Swartz  ("Swartz"),  the  officers of AP&C,  may be
                                      deemed to have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 20,511 shares, all of which are directly owned by AK. AP&C, the general partner
                                      of AK, may be deemed to have sole power to dispose of these shares, and Breyer,
                                      Evnin,  Hill,  Patterson,  Sednaoui and Swartz,  the  officers of AP&C,  may be
                                      deemed to have shared power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           20,511

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           less than 5%
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 6 of 27


<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel Investors '95 L.P.

- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    46,416 share , except that James W. Breyer ("Breyer"), Luke B. Evnin ("Evnin"),
                                      Eugene D. Hill, III ("Hill"), Paul H. Klingenstein ("Klingenstein"),  Arthur C.
                                      Patterson  ("Patterson"),  G. Carter Sednaoui ("Sednaoui ") and James R. Swartz
                                      ("Swartz"), the general partners of AI95, may be deemed to have shared power to
                                      vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 46,416  shares,  except that  Breyer,  Evnin,  Hill,  Klingenstein,  Patterson,
                                      Sednaoui and Swartz, the general partners of AI95, may be deemed to have shared
                                      power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           46,416

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           less than 5%
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 7 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Swartz Family Partnership L.P. ("SFP")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    2,585,203  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      1,277,193 are directly owned by Accel VII L.P.  ("A7") and 319,298 are directly
                                      owned by Accel  Internet Fund III L.P.  ("AIF3").  SFP is a general  partner of
                                      Accel IV  Associates  L.L.C.  ("A4A"),  the  general  partner of A4, a managing
                                      member of Accel VII Associates  L.P.  ("A7A"),  the general partner of A7 and a
                                      managing  member of Accel  Internet Fund III  Associates  L.P.  ("AIF3A"),  the
                                      general  partner of AIF3 and may be deemed to have  shared  power to vote these
                                      shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   0 Shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 2,585,203  shares,  of which  988,712 are directly  owned by A4,  1,277,193 are
                                      directly  owned by A7 and 319,298 are directly  owned by AIF3. SFP is a general
                                      partner  of A4A,  the  general  partner of A4, a  managing  member of A7A,  the
                                      general  partner of A7 and a managing  member of AIF3A,  the general partner of
                                      AIF3 and may be deemed to have shared power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      0 Shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,585,203

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           24.2%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 8 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel VII L.P. ("A7")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    1,277,193 shares,  except that Accel VII Associates L.L.C. ("A7A"), the general
                                      partner of A7, may be deemed to have sole power to vote these  shares,  and ACP
                                      Family  Partnership L.P.  ("ACPFP"),  Swartz Family  Partnership L.P.  ("SFP"),
                                      James W. Breyer ("Breyer"),  G. Carter Sednaoui  ("Sednaoui"),  James R. Swartz
                                      ("Swartz"),  Arthur C. Patterson and J. Peter Wagner  ("Wagner"),  the managing
                                      members of A7A, may be deemed to have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 1,277,193 shares,  except that A7A, the general partner of A7, may be deemed to
                                      have sole power to dispose of these shares,  and ACPFP, SFP, Breyer,  Sednaoui,
                                      Swartz and Wagner,  the  managing  members of A7A, may be deemed to have shared
                                      power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,277,193

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           12.0%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 9 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel VII Associates L.P. ("A7A")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    1,277,193  shares,  all of wich are  directly  owned by Accel VII L.P.  ("A7").
                                      Accel VII Associates L.L.C.  ("A7A"),  the general partner of A7, may be deemed
                                      to have sole  power to vote  these  shares,  and ACP  Family  Partnership  L.P.
                                      ("ACPFP"),  Swartz Family Partnership L.P. ("SFP"), James W. Breyer ("Breyer"),
                                      G.  Carter  Sednaoui  ("Sednaoui"),  James  R.  Swartz  ("Swartz"),  Arthur  C.
                                      Patterson ("Patterson") and J. Peter Wagner ("Wagner"), the managing members of
                                      A7A, may be deemed to have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 1,277,193  shares,  all of which are  directly  owned by A7.  A7A,  the general
                                      partner of A7, may be deemed to have sole power to dispose of these shares, and
                                      ACPFP, SFP, Breyer,  Sednaoui,  Swartz and Wagner, the managing members of A7A,
                                      may be deemed to have shared power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,277,193

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           12.0%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>
                                                    Page 10 of 27


<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------

- ---------- ---------------------------------------------------------------------------------------------------------
<S>                                                                                                      <C>
           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel Internet Fund III L.P. ("AIF3")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    319,298  shares,   except  that  Accel  Internet  Fund  III  Associates  L.L.C.
                                      ("AIF3A"),  the  general  partner of AIF3,  may be deemed to have sole power to
                                      vote these shares,  and ACP Family  Partnership L.P.  ("ACPFP"),  Swartz Family
                                      Partnership  L.P.  ("SFP"),  James W. Breyer  ("Breyer"),  Arthur C.  Patterson
                                      ("Patterson"), G. Carter Sednaoui ("Sednaoui"),  James R. Swartz ("Swartz") and
                                      J. Peter Wagner  ("Wagner"),  the managing  members of AIF3A,  may be deemed to
                                      have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 319,298 shares,  except that AIF3A,  the general partner of AIF3, may be deemed
                                      to have  sole  power to  dispose  of these  shares,  and  ACPFP,  SFP,  Breyer,
                                      Patterson,  Sednaoui,  Swartz and Wagner, the managing members of AIF3A, may be
                                      deemed to have shared power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           319,298

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           Less than 5%.
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 11 of 27

<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------

- ---------- ---------------------------------------------------------------------------------------------------------
<S>                                                                                                      <C>
           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel Internet Fund III Associates L.P. ("AIF3A")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    319,298  shares,  all of  which  are  owned  by  Accel  Internet  Fund III L.P.
                                      ("AIF3").  AIF3A, the general partner of AIF3, may be deemed to have sole power
                                      to vote these shares, and ACP Family Partnership L.P. ("ACPFP"),  Swartz Family
                                      Partnership  L.P.  ("SFP"),  James W. Breyer  ("Breyer"),  Arthur C.  Patterson
                                      ("Patterson"), G. Carter Sednaoui ("Sednaoui"),  James R. Swartz ("Swartz") and
                                      J. Peter Wagner  ("Wagner"),  the managing  members of AIF3A,  may be deemed to
                                      have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 319,298 shares,  all of which are owned by AIF3.  AIF3A, the general partner of
                                      AIF3,  may be deemed to have sole power to dispose of these shares,  and ACPFP,
                                      SFP, Breyer,  Patterson,  Sednaoui,  Swartz and Wagner, the managing members of
                                      AIF3, may be deemed to have shared power to dispose of these shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           319,298

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           Less than 5%.
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 12 of 27

<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Accel Investors `99 L.P. ("AI99")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of Delaware

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    157,895  shares,  except  that  Arthur C.  Patterson  ("Patterson"),  G. Carter
                                      Sednaoui  ("Sednaoui  "),  James  R.  Swartz  ("Swartz")  and J.  Peter  Wagner
                                      ("Wagner"), the general partners of AI99, may be deemed to have shared power to
                                      vote these shares.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   See Response to Row 7.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 157,895 shares, except that Patterson, Sednaoui, Swartz and Wagner, the general
                                      partners  of AI99,  may be  deemed to have  shared  power to  dispose  of these
                                      shares.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH

                                      See Response to Row 9.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           157,895

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           Less than 5%.
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           ACP Family Partnership L.P. ("ACPFLP")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a)  / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           State of California

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                     -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   1,596,491  shares,  of which  1,277,193  are  directly  owned by Accel VII L.P.
                                      ("A7") and 319,298 are directly owned by Accel Internet Fund III L.P. ("AIF3").
                                      ACPFLP is a managing member of Accel VII Associates L.P.  ("A7A"),  the general
                                      partner of A7, and a managing member of Accel Internet Fund III Associates L.P.
                                      ("AIF3A"),  the general partner of AIF3, and may be deemed to have shared power
                                      to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                   -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      1,596,491  shares,  of which  1,277,193  are  directly  owned by Accel VII L.P.
                                      ("A7") and 319,298 are directly owned by Accel Internet Fund III L.P. ("AIF3").
                                      ACPFLP is a managing member of Accel VII Associates L.P.  ("A7A"),  the general
                                      partner of A7, and a managing member of Accel Internet Fund III Associates L.P.
                                      ("AIF3A"),  the general partner of AIF3, and may be deemed to have shared power
                                      to dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,596,491

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           15.0%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           PN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 14 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           James W. Breyer ("Breyer")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   2,652,130  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  and 319,298 are directly  owned by Accel Internet Fund
                                      III L.P.  ("AIF3").  Breyer is a general  partner of Accel IV  Associates  L.P.
                                      ("A4A"),  the general  partner of A4, a general  partner of AI95, an officer of
                                      Accel Partners & Co. ("AC&P"),  the general partner of AK, a managing member of
                                      Accel VII Associates L.L.C.  ("A7A"), the general partner of A7, and a managing
                                      member of Accel  Internet Fund III  Associates  L.L.C.  ("AIF3A"),  the general
                                      partner of AIF3 and may be deemed to have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                   -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      2,652,130  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  and 319,298 are directly  owned by Accel Internet Fund
                                      III L.P.  ("AIF3").  Breyer is a general  partner of Accel IV  Associates  L.P.
                                      ("A4A"),  the general  partner of A4, a general  partner of AI95, an officer of
                                      Accel Partners & Co. ("AC&P"),  the general partner of AK, a managing member of
                                      Accel VII Associates  L.L.C ("A7A"),  the general partner of A7, and a managing
                                      member of Accel  Internet Fund III  Associates  L.L.C.  ("AIF3A"),  the general
                                      partner  of AIF3 and may be deemed to have  shared  power to  dispose  of these
                                      shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,652,130

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           24.8%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
                                                    Page 15 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Luke B. Evnin ("Evnin")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   1,055,639  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      20,511 are directly owned by Accel Keiretsu L.P. ("AK") and 46,416 are directly
                                      owned by Accel Investors `95 L.P. ("AI95"). Evnin is a general partner of Accel
                                      IV Associates L.P. ("A4A"),  the general partner of A4, and an officer of AP&C,
                                      the general  partner of AK, and a general  partner of AI95 and may be deemed to
                                      have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                   -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      1,055,639  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      20,511 are directly owned by Accel Keiretsu L.P. ("AK") and 46,416 are directly
                                      owned by Accel Investors `95 L.P. ("AI95"). Evnin is a general partner of Accel
                                      IV Associates L.P. ("A4A"),  the general partner of A4, and an officer of AP&C,
                                      the general  partner of AK, and a general  partner of AI95 and may be deemed to
                                      have shared power to dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,055,639

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           9.9%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>

<PAGE>
                                                    Page 16 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Eugene D. Hill, III ("Hill")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   1,055,639  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      20,511 are directly owned by Accel Keiretsu L.P. ("AK") and 46,416 are directly
                                      owned by Accel Investors `95 L.P. ("AI95").  Hill is a general partner of Accel
                                      IV Associates L.P. ("A4A"),  the general partner of A4, and an officer of AP&C,
                                      the general  partner of AK, and a general  partner of AI95 and may be deemed to
                                      have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                   -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      1,055,639  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      20,511 are directly owned by Accel Keiretsu L.P. ("AK") and 46,416 are directly
                                      owned by Accel Investors `95 L.P. ("AI95").  Hill is a general partner of Accel
                                      IV Associates L.P. ("A4A"),  the general partner of A4, and an officer of AP&C,
                                      the general  partner of AK, and a general  partner of AI95 and may be deemed to
                                      have shared power to dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,055,639

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           9.9%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 17 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Paul H. Klingenstein ("Klingenstein")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED
                                      1,035,128  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      and  46,416  are  directly  owned  by  Accel   Investors  `95  L.P.   ("AI95").
                                      Klingenstein  is a general  partner of Accel IV Associates  L.P.  ("A4A") and a
                                      general  partner of AI95 and may be deemed to have  shared  power to vote these
                                      shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                   -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      1,035,128  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      and  46,416  are  directly  owned  by  Accel   Investors  `95  L.P.   ("AI95").
                                      Klingenstein  is a general  partner of Accel IV Associates  L.P.  ("A4A"),  the
                                      general  partner of A4 and a general  partner of AI95 and may be deemed to have
                                      shared power to dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,035,128

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           9.7%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 18 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------
           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           Arthur C. Patterson ("Patterson")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF
                                      23,749  shares which are all directly  owned by Ellmore C.  Patterson  Partners
                                      ("ECPP").  Patterson is the sole general partner of ECPP and therefore has sole
                                      voting power.
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   2,810,025  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  319,298 are directly  owned by Accel Internet Fund III
                                      L.P.  ("AIF3")  and  157,895 are  directly  owned by Accel  Investors  '99 L.P.
                                      ("AI99").  Patterson is a general partner of Accel IV Associates L.P.  ("A4A"),
                                      the general partner of A4, a general partner of AI95, a co-owner and officer of
                                      Accel Partners & Co. ("AC&P"),  the general partner of AK, a managing member of
                                      Accel VII Associates L.L.C.  ("A7A"), the general partner of A7, and a managing
                                      member of Accel  Internet Fund III  Associates  L.L.C.  ("AIF3A"),  the general
                                      partner of AIF3 and may be deemed to have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                 23,749  shares which are all directly  owned by Ellmore C.  Patterson  Partners
                                      ("ECPP").  Patterson is the sole general partner of ECPP and therefore has sole
                                      dispositive power.
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      2,810,025  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  and 319,298 are directly  owned by Accel Internet Fund
                                      III L.P.  ("AIF3") and 157,895 are directly  owned by Accel  Investors '99 L.P.
                                      ("AI 99").  Patterson is a general partner of Accel IV Associates L.P. ("A4A"),
                                      the  general  partner  of A4, a general  partner  of AI95,  an officer of Accel
                                      Partners & Co. ("AC&P"),  the general partner of AK, a managing member of Accel
                                      VII Associates L.L.C. ("A7A"), the general partner of A7, and a managing member
                                      of Accel Internet Fund III Associates L.L.C. ("AIF3A"),  the general partner of
                                      AIF3 and may be deemed to have shared power to dispose of these shares.

- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,833,774

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           26.5%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN
- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                                    Page 19 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------
           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           G. Carter Sednaoui ("Sednaoui")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                   2,810,025  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  319,298 are directly  owned by Accel Internet Fund III
                                      L.P.  ("AIF3")  and  157,895 are  directly  owned by Accel  Investors  '99 L.P.
                                      ("AI99").  Sednaoui is a general partner of Accel IV Associates  L.P.  ("A4A"),
                                      the general  partner of A4, a general partner of AI95,a co-owner and an officer
                                      of Accel Partners & Co. ("AC&P"),  the general partner of AK, a managing member
                                      of Accel VII Associates L.L.C.  ("A7A"),  the general partner of A7, a managing
                                      member of Accel  Internet Fund III  Associates  L.L.C.  ("AIF3A"),  the general
                                      partner of AIF3, and a general partner of AI99 and may be deemed to have shared
                                      power to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                  -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      2,810,025  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  319,298 are directly  owned by Accel Internet Fund III
                                      L.P.  ("AIF3")  and  157,895 are  directly  owned by Accel  Investors  `99 L.P.
                                      ("AI99").  Sednaoui is a general partner of Accel IV Associates  L.P.  ("A4A"),
                                      the general  partner of A4, a general  partner of AI95,  a general  partner and
                                      officer of Accel Partners & Co. ("AC&P"), the general partner of AK, a managing
                                      member of Accel VII Associates  L.L.C.  ("A7A"),  the general  partner of A7, a
                                      managing  member of Accel Internet Fund III Associates  L.L.C.  ("AIF3A"),  the
                                      general  partner  of AIF3,  and a general  partner of AI99 and may be deemed to
                                      have shared power to dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,810,025

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           26.3%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
                                                    Page 20 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           James R. Swartz ("Swartz")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen
- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED                    2,810,025  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  319,298 are directly  owned by Accel Internet Fund III
                                      L.P.  ("AIF3")  and  157,895 are  directly  owned by Accel  Investors  '99 L.P.
                                      ("AI99").  Swartz is a general partner of Accel IV Associates L.P. ("A4A"), the
                                      general  partner of A4, a general  partner of AI95,  a co-owner  and officer of
                                      Accel Partners & Co. ("AC&P"),  the general partner of AK, a managing member of
                                      Accel VII  Associates  L.L.C.  ("A7A"),  the general  partner of A7, a managing
                                      member of Accel  Internet Fund III  Associates  L.L.C.  ("AIF3A"),  the general
                                      partner of AIF3, and a general partner of AI99 and may be deemed to have shared
                                      power to vote these shares.

                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                  -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      2,810,025  shares, of which 988,712 are directly owned by Accel IV L.P. ("A4"),
                                      46,416 are directly  owned by Accel  Investors  '95 L.P.  ("AI95"),  20,511 are
                                      directly owned by Accel Kieretsu L.P.  ("AK"),  1,277,193 are directly owned by
                                      Accel VII L.P.  ("A7"),  319,298 are directly  owned by Accel Internet Fund III
                                      L.P.  ("AIF3")  and  157,895 are  directly  owned by Accel  Investors  '99 L.P.
                                      ("AI99").  Swartz is a general partner of Accel IV Associates L.P. ("A4A"), the
                                      general  partner of A4, a general partner of AI95, an officer of Accel Partners
                                      & Co.  ("AC&P"),  the  general  partner of AK, a  managing  member of Accel VII
                                      Associates  L.L.C.  ("A7A"),  the general  partner of A7, a managing  member of
                                      Accel Internet Fund III Associates  L.L.C.  ("AIF3A"),  the general  partner of
                                      AIF3,  and a general  partner of AI99 and may be deemed to have shared power to
                                      dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           2,810,025
- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           26.3%
- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN
- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>
<PAGE>
                                                    Page 21 of 27
<TABLE>
<CAPTION>
- ------------------------------------------------

CUSIP NO.  44860K102
- ------------------------------------------------
<S>                                                                                                      <C>
- ---------- ---------------------------------------------------------------------------------------------------------

           NAME OF REPORTING PERSON
    1      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

           J. Peter Wagner ("Wagner")
- ---------- ---------------------------------------------------------------------------------------------------------
           CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                                              (a) / /
    2                                                                                                    (b) /X/

- ---------- ---------------------------------------------------------------------------------------------------------
    3      SEC USE ONLY

- ---------- ---------------------------------------------------------------------------------------------------------
    4      SOURCE OF FUNDS

           Not Applicable

- ---------- ---------------------------------------------------------------------------------------------------------
    5      CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)           / /

- ---------- ---------------------------------------------------------------------------------------------------------
    6      CITIZENSHIP OR PLACE OF ORGANIZATION

           U.S. Citizen

- ---------- ---------------------------------------------------------------------------------------------------------
                                7     SOLE VOTING POWER
              NUMBER
                OF                    -0-
                             -------- ------------------------------------------------------------------------------
              SHARES            8     SHARED VOTING POWER
           BENEFICIALLY
              OWNED
                                      1,754,386  shares,  of which  1,277,193  are  directly  owned by Accel VII L.P.
                                      ("A7"), 319,298 are directly owned by Accel Internet Fund III L.P. ("AIF3") and
                                      157,895 are directly owned by Accel  Investors '99 L.P.  ("AI99").  Wagner is a
                                      managing member of Accel VII Associates L.L.C.  ("A7A"), the general partner of
                                      A7, a managing member of Accel Internet Fund III Associates  L.L.C.  ("AIF3A"),
                                      the general partner of AIF3, and a general partner of AI99 and may be deemed to
                                      have shared power to vote these shares.
                             -------- ------------------------------------------------------------------------------
                BY              9     SOLE DISPOSITIVE POWER
               EACH
            REPORTING                   -0-
                             -------- ------------------------------------------------------------------------------
              PERSON            10    SHARED DISPOSITIVE POWER
               WITH
                                      1,754,386  shares,  of which  1,277,193  are  directly  owned by Accel VII L.P.
                                      ("A7"), 319,298 are directly owned by Accel Internet Fund III L.P. ("AIF3") and
                                      157,895 are directly owned by Accel  Investors '99 L.P.  ("AI99").  Wagner is a
                                      managing member of Accel VII Associates L.L.C.  ("A7A"), the general partner of
                                      A7, a managing member of Accel Internet Fund III Associates  L.L.C.  ("AIF3A"),
                                      the general partner of AIF3, and a general partner of AI99 and may be deemed to
                                      have shared power to dispose of these shares.
- ---------- ---------------------------------------------------------------------------------------------------------
    11     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

           1,754,386

- ---------- ---------------------------------------------------------------------------------------------------------
    12     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES                             / /

- ---------- ---------------------------------------------------------------------------------------------------------
    13     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

           16.4%

- ---------- ---------------------------------------------------------------------------------------------------------
    14     TYPE OF REPORTING PERSON

           IN

- ---------- ---------------------------------------------------------------------------------------------------------
</TABLE>


<PAGE>
                                  Page 22 of 27

1.       ITEM 1.  SECURITY AND ISSUER.

         Common Stock of Hybrid Networks, Inc.

         The principal executive offices of Hybrid Networks, Inc. are located at
6409 Guadalupe Mines Road, San Jose, California 95120.

2.       ITEM 2.  IDENTITY AND BACKGROUND.

         (a) This  Statement  is filed by  Accel  IV L.P.,  a  Delaware  limited
partnership ("A4"), Accel IV Associates L.P., a Delaware limited partnership and
the general  partner of A4 ("A4A"),  Accel  Keiretsu  L.P.,  a Delaware  limited
partnership  ("AK"),  Accel Partners & Co. Inc., a Delaware  corporation and the
general  partner of AK ("AP&C"),  Accel  Investors '95 L.P., a Delaware  limited
partnership  ("AI95"),  Accel VII L.P., a Delaware limited  partnership  ("A7"),
Accel VII Associates L.P., a Delaware limited  liability company ("A7A") and the
general  partner  of A7,  Accel  Internet  Fund III  L.P.,  a  Delaware  limited
partnership  ("AIF3"),  Accel  Internet Fund III Associates  L.L.C.,  a Delaware
limited  liability  company  ("AIF3A")  and the general  partner of AIF3,  Accel
Investors '99 L.P., a Delaware limited partnership ("AI99"),  Accel Partners and
Co. Inc. ("AP&C"), ACP Family Partnership L.P., a California limited partnership
and managing member of A7A and a managing member of AIF3A ("ACPFLP"), the Swartz
Family  Partnership L.P. ("SFP"),  a Delaware limited  partnership and a general
partner of A4A and managing member of A7A and a managing member of AIF3A,  James
W. Breyer  ("Breyer"),  a general  partner of A4A, an officer of AP&C, a general
partner  of AI95,  a general  partner of AI99,  a  managing  member of A7A and a
managing member of AIF3A, Luke B. Evnin ("Evnin"),  a general partner of A4A, an
officer of AP&C and a general partner of AI95,  Eugene D. Hill, III ("Hill"),  a
general  partner of A4A, an officer of AP&C, and a general partner of AI95, Paul
H. Klingenstein ("Klingenstein"), a general partner of A4A and a general partner
of AI95, Arthur C. Patterson ("Patterson"), a general partner of A4A, a co-owner
and an officer of AP&C, a general  partner of AI99, a general partner of AI95, a
managing  member  of A7A and a  managing  member of AIF3A,  G.  Carter  Sednaoui
("Sednaoui"), a general partner of A4A, an officer of AP&C, a general partner of
AI99, a general  partner of AI95 and a managing  member of A7A,  James R. Swartz
("Swartz"),  a general  partner  of A4A, a  co-owner  and an officer of AP&C,  a
general  partner of AI95, a managing  member of A7A, a managing  member of AIF3A
and a general partner of AI99 and J. Peter Wagner, a managing member of AIF3A, a
managing member of A7A and general  partner of AI99. The foregoing  entities and
individuals are collectively referred to as the "Reporting Persons."

         A4A,  the  general  partner  of A4, may be deemed to have sole power to
vote and sole power to dispose  of shares of the  issuer  directly  owned by A4.
AP&C,  the  general  partner of AK, may be deemed to have sole power to vote and
sole power to dispose of shares of the issuer  directly  owned by AK.  A7A,  the
general  partner  of A7, may be deemed to have sole power to vote and sole power
to dispose of shares of the issuer  directly  owned by A7.  AIF3A,  the  general
partner  of AIF3,  may be deemed to have  sole  power to vote and sole  power to
dispose of shares of the issuer  directly  owned by AIF3.  SFP,  Breyer,  Evnin,
Hill, Klingenstein,  Patterson, Sednaoui, and Swartz are the general partners of
A4A and may be deemed to have shared  power to vote and shared  power to dispose
of shares of the issuer directly owned by A4. Breyer,  Evnin,  Hill,  Patterson,
Sednaoui  and Swartz are officers of AP&C and may be deemed to have shared power
to vote and shared  power to dispose of shares of the issuer  directly  owned by
AK. Breyer, Evnin, Hill,  Klingenstein,  Patterson,  Sednaoui and Swartz are the
general  partners  of AI95 and may be  deemed to have  shared  power to vote and
shared power to dispose of shares of the issuer directly owned by AI95.  ACPFLP,
SFP, Breyer, Sednaoui,  Swartz and Wagner are managing members of A7A and may be
deemed to have shared power to vote and shared power to dispose of shares of the
issuer directly owned by A7. ACPFLP, SFP, Breyer,  Patterson,  Sednaoui,  Swartz
and Wagner are managing  members of AIF3A and may be deemed to have shared power
to vote and shared  power to dispose of shares of the issuer  directly  owned by
AIF3.  Patterson,  Sednaoui,  Swartz and Wagner are the general partners of AI99
and may be deemed to have  shared  power to vote and shared  power to dispose of
shares of the issuer directly owned by AI99.

         A4, A4A, AK, AI95,  A7, A7A,  AIF3,  AIF3A,  AI99, and SFP are Delaware
limited  partnerships.  ACPFLP is a California  limited  partnership.  AP&C is a
Delaware corporation.  Breyer, Evnin, Hill, Klingenstein,  Patterson,  Sednaoui,
Swartz and Wagner are United States citizens. Each of the foregoing are referred
to as a "Reporting Person" and collectively as the "Reporting Persons."

         (b) The principal business offices of the Reporting Persons are located
at 428 University Avenue, Palo Alto, CA 94301

         (c) Accel  Partners and its  affiliates  are private  investment  funds
whose principal business includes investing in early-stage  technology companies
for its account.

         (d) During the last five years,  none of the Reporting Persons has been
convicted in a criminal  proceeding  (excluding  traffic  violations  or similar
misdemeanors).

         (e) During the last five years,  none of the Reporting Persons has been
a party to a civil proceeding of a judicial or administrative  body of competent
jurisdiction  which resulted in a judgment,  decree or final order (i) enjoining
future violations

- --------------------------------------------------------------------------------
<PAGE>
                                 Page 23 of 27


of,  or  prohibiting  or  mandating  activities  subject  to,  Federal  or State
securities laws or (ii) finding any violation with respect to such laws.

         (f) A4, A4A, AK, AI95, A7, A7A, AIF3,  AIF3A, AI99 and SFP are Delaware
limited  partnerships.  ACPFLP is a California  limited  partnership.  AP&C is a
Delaware corporation.  Breyer, Evnin, Hill, Klingenstein,  Patterson,  Sednaoui,
Swartz and Wagner are United States citizens. Each of the foregoing are referred
to as a "Reporting Person" and collectively as the "Reporting Persons."

3.       ITEM 3. SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION.

         Not Applicable.

4.       ITEM 4.  PURPOSE OF TRANSACTION.

         The Reporting  Persons purchased the Common Stock based on their belief
that they represented an attractive investment  opportunity.  The acquisition of
the Common  Stock was made in the  ordinary  course of business and was not made
for the purpose of acquiring control of the Issuer.

         Depending   upon   overall   market   conditions,    other   investment
opportunities  available  to the  Reporting  Persons  and  the  availability  of
securities  of the Company at prices that would make the purchase of  additional
securities  of  the  Company  desirable,   Accel  Partners  and  its  affiliates
(including the Reporting Persons) may endeavor to increase their position in the
Issuer through the purchase of additional  securities of the Company on the open
market or in private transactions,  through a tender offer or otherwise, on such
terms and at such times as Accel  Partners  and its  affiliates  (including  the
Reporting Persons) may deem advisable.

         The  Reporting  Persons do not have any present plan or proposal  which
would relate to or result in any of the matters set forth in  subparagraphs  (a)
through  (j) of Item 4 of  Schedule  13D  except as set forth  herein or such as
would occur upon completion of any of the actions discussed above. The Reporting
Persons  intend to review their  investment in the Issuer on a continuing  basis
and, depending on various factors, including the Issuer's financial position and
investment  strategy,  the price levels of the Common  Stock,  conditions in the
securities  markets and general  economic  and industry  conditions,  may in the
future take such  actions  with  respect to its  investment  in the Issuer as it
deems  appropriate,  including  purchasing  additional shares of Common Stock or
selling  some or all of the  Common  Stock,  or to change  its  intentions  with
respect to any and all matters referred to in Item 4.

5.       ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.

                  (a)      Amount beneficially owned.

                           See Row 9 of cover page for each Reporting Person.

                  (b)      Number of shares as to which such person has:

                           (i)      Sole power to vote or to direct the vote:

                                    See Row 5 of cover  page for each  Reporting
                                    Person.

                           (ii)     Shared power to vote or to direct the vote:

                                    See Row 6 of cover  page for each  Reporting
                                    Person.

                           (iii)    Sole  power  to  dispose  or to  direct  the
                                    disposition of:

                                    See Row 7 of cover  page for each  Reporting
                                    Person.

                           (iv)     Shared  power to  dispose  or to direct  the
                                    disposition of:

                                    See Row 8 of cover  page for each  Reporting
                                    Person.

                  (c)      No Reporting Person effected any  transactions  other
                           than those set forth in Items 3 and 4 above.

                  (d)      No person other than the Reporting Person is known to
                           the Reporting  Person to have the right to receive or
                           the power to direct the receipt of dividends from, or
                           the proceeds  from,  the sale of the


<PAGE>
                                 Page 24 of 27


                           shares of  Common  Stock of the  Issuer  owned by the
                           respective Reporting Person.

                  (e)      Not Applicable.


6.         ITEM 6.        CONTRACTS,     ARRANGEMENTS,     UNDERSTANDINGS     OR
                          RELATIONSHIPS WITH RESPECT TO THE ISSUER.

                           Not Applicable.


7.         ITEM 7.         MATERIALS TO BE FILED AS EXHIBITS.

                           Exhibit A:  Agreement of Joint Filing.
                           Exhibit B:  Reference   to   G. Carter   Sednaoui  as
                           Attorney-in-Fact.


                                   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.

Date:  March __, 2000

Entities:           Accel IV L.P.
                    Accel IV Associates L.P.
                    Accel Keiretsu L.P.
                    Accel Investors '95 L.P.
                    Accel VII L.P.
                    Accel VII Associates L.P.
                    Accel Internet Fund III L.P.
                    Accel Internet Fund III Associates L.P.
                    Accel Investors '99 L.P.
                    Accel Partners and Co. Inc.
                    ACP Family Limited Partnership
                    Swartz Family Partnership L.P.

                                                     By:  /s/ G. Carter Sednaoui
                                                     ---------------------------

                               G. Carter Sednaoui,
                            Attorney-in-fact for the
                              above-listed entities

Individuals:        James W. Breyer
                    Luke. B. Evnin
                    Eugene D. Hill, III
                    Paul H. Klingenstein
                    Arthur C. Patterson
                    G. Carter Sednaoui
                    James R. Swartz
                    J. Peter Wagner

                                                     By:  /s/ G. Carter Sednaoui
                                                     ---------------------------

                               G. Carter Sednaoui,
                            Attorney-in-fact for the
                            above-listed individuals


- --------------------------------------------------------------------------------
<PAGE>
                                 Page 25 of 27


                                  EXHIBIT INDEX

                                                                    Found on
                                                                  Sequentially
Exhibit                                                           Numbered Page
- -------                                                           -------------
Exhibit A:  Agreement of Joint Filing                                  28
Exhibit B:  Reference to G. Carter Sednaoui as Attorney-in-Fact        29



- --------------------------------------------------------------------------------


<PAGE>
                                 Page 26 of 27


                                    EXHIBIT A

                            Agreement of Joint Filing

                  The Reporting  Persons have agreed that a single  Schedule 13G
(or any amendment thereto) relating to the Common Stock of Hybrid Networks, Inc.
shall be filed on behalf of each of the Reporting Persons. Note that a copies of
the  applicable  Agreement  of  Joint  Filing  are  already  on  file  with  the
appropriate agencies.



<PAGE>
                                 Page 27 of 27


                                    EXHIBIT B

               Reference to G. Carter Sednaoui as Attorney-in-Fact

         G.   Carter   Sednaoui   has   signed   the   enclosed   documents   as
Attorney-In-Fact.  Note that copies of the  applicable  Power of  Attorneys  are
already on file with the appropriate agencies.



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