ADFORCE INC
SC 13G, 2000-02-14
COMPUTER PROCESSING & DATA PREPARATION
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G
                                 (Rule 13d-102)

 INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT TO RULES 13d-1 (b), (c)
           AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2 (b)
                             (Amendment No._______)*

                                 AdForce, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                                  Common Stock
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   006867 10 5
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 1999
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

Check the  appropriate box to designate the rule pursuant to which this Schedule
is filed:

             [ ]     Rule 13d-1(b)

             [ ]     Rule 13d-(c)

             [X]     Rule 13d-1(d)

*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for  any  subsequent   amendment   containing   information  which  would  alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but  shall be  subject  to all other  provisions  of the Act  (however,  see the
Notes).

                         (Continued on following pages)

                               Page 1 of 14 Pages
                       Exhibit Index Contained on Page 13


<PAGE>
<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 2 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING

             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      Hummer Winblad Venture Partners II, L.P. ("HWVP II")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             Delaware

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

                                     5        SOLE VOTING POWER

             NUMBER OF                        1,170,388 shares, except that HWEP II, the general partner of HWVP II,
              SHARES                          may be deemed to have sole voting power, and John R. Hummer ("Hummer"),
           BENEFICIALLY                       Ann L. Winblad ("Winblad ") and Mark Gorenberg ("Gorenberg"), the
      OWNED BY EACH REPORTING                 members of HWEP II, may be deemed to have shared power to vote these
              PERSON                          shares.
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED  VOTING  POWER
                                              See response to row 5.
\
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER

                                              1,170,388  shares,  except that HWEP II, the general  partner of HWVP II,
                                              may be deemed to have sole  dispositive  power,  and Hummer,  Winblad and
                                              Gorenberg,  the members of HWEP II, may be deemed to have shared power to
                                              dispose of these shares.

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

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,170,388

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.19%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 3 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING

             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      Hummer Winblad Technology Fund II, L.P. ("HWTF II")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             Delaware

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

              NUMBER OF              5        SOLE VOTING POWER
               SHARES
            BENEFICIALLY                      41,450 shares,  except that HWEP II, the general  partner of HWTF II, may
       OWNED BY EACH REPORTING                be deemed to have sole voting power,  and John R. Hummer ("Hummer "), Ann
               PERSON                         L. Winblad ("Winblad ")and Mark Gorenberg  ("Gorenberg"),  the members of
                WITH                          HWEP II, may be deemed to have shared power to vote these shares.

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

                                     6        SHARED  VOTING  POWER

                                              See response to row 5.

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

                                     7        SOLE DISPOSITIVE POWER

                                              41,450 shares,  except that HWEP II, the general  partner of HWTF II, may
                                              be  deemed  to have sole  dispositive  power,  and  Hummer,  Winblad  and
                                              Gorenberg,  the members of HWEP II, may be deemed to have shared power to
                                              dispose of these shares.

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

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       41,450

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.25%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 4 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING

             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      Hummer Winblad Technology Fund IIA, L.P. ("HWTF IIA")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             Delaware

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

                   NUMBER OF         5        SOLE VOTING POWER
                    SHARES
                 BENEFICIALLY                 7,314 shares, except that HWEP II, the general partner of HWTF IIA, may
            OWNED BY EACH REPORTING           be deemed to have sole voting power, and John R. Hummer ("Hummer"), Ann
                    PERSON                    L. Winblad ("Winblad ") and Mark Gorenberg ("Gorenberg "), the members of
                     WITH                     HWEP II, may be deemed to have shared power to vote these shares.


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

                                     6        SHARED  VOTING  POWER

                                              See response to row 5.

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

                                     7        SOLE DISPOSITIVE POWER

                                              7,314 shares,  except that HWEP II, the general  partner of HWTF IIA, may
                                              be  deemed  to have sole  dispositive  power,  and  Hummer,  Winblad  and
                                              Gorenberg,  the members of HWEP II, may be deemed to have shared power to
                                              dispose of these shares.

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

                                     8        SHARED   DISPOSITIVE   POWER

                                              See response to row 7.

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       7,314

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.04%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>
<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 5 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING

             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      Hummer Winblad Equity Partners II, L.L.C. ("HWEP II")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             Delaware

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

            NUMBER OF                5        SOLE VOTING POWER
             SHARES
          BENEFICIALLY
     OWNED BY EACH REPORTING                  1,219,152  shares,  of which  1,170,388  are  directly  owned by HWVP II,
             PERSON                           41,450 shares are directly owned by HWTF II and 7,314 shares are directly
              WITH                            owned by HWTF IIA.  HWEP II, the general  partner of HWVP II, HWTF II and
                                              HWTF IIA, may be deemed to have sole voting  power,  and Hummer,  Winblad
                                              and Gorenberg, the members of HWEP II, may be deemed to have shared power
                                              to vote these shares.

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

                                     6        SHARED VOTING POWER
                                              0 shares

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

                                     7        SOLE DISPOSITIVE POWER

                                              1,219,152  shares,  of which  1,170,388  are  directly  owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA.  HWEP II, the general  partner of HWVP II, HWTF II and
                                              HWTF  IIA,  may be deemed to have sole  dispositive  power,  and  Hummer,
                                              Winblad  and  Gorenberg,  the  members  of HWEP II, may be deemed to have
                                              shared power to dispose these shares.

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

                                     8        SHARED DISPOSITIVE POWER

                                              0 shares

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,219,152

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.49%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    OO

- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>
<PAGE>
<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 6 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING

             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      John R. Hummer ("Hummer")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             U.S. Citizen

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

           NUMBER OF                 5        SOLE VOTING POWER
            SHARES                            0 shares
         BENEFICIALLY
    OWNED BY EACH REPORTING          -------- ------------------------------------------------------------------------
            PERSON
             WITH                    6        SHARED VOTING POWER

                                              1,219,152 shares, of which 1,170,388 are directly owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA. Hummer, a member of HWEP II, may be deemed to have
                                              shared power to vote these shares.

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

                                     7        SOLE DISPOSITIVE POWER

                                              0 shares

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

                                     8        SHARED DISPOSITIVE POWER

                                              1,219,152  shares,  of which  1,170,388  are  directly  owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA.  Hummer,  a member  of HWEP II,  may be deemed to have
                                              shared power to vote these shares.

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,219,152

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.49%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>

<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 7 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

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

1            NAME OF REPORTING
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      Ann L. Winblad ("Winblad")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             U.S. Citizen

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

                NUMBER OF            5        SOLE VOTING POWER
                 SHARES
              BENEFICIALLY                    0 shares
         OWNED BY EACH REPORTING
                 PERSON              -------- ------------------------------------------------------------------------
                  WITH
                                     6        SHARED VOTING POWER

                                              1,219,152 shares, of which 1,170,388 are directly owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA. Winblad, a member of HWEP II, may be deemed to have
                                              shared power to vote these shares.

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

                                     7        SOLE DISPOSITIVE POWER

                                              0 shares

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

                                     8        SHARED DISPOSITIVE POWER

                                              1,219,152  shares,  of which  1,170,388  are  directly  owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA.  Winblad,  a member of HWEP II,  may be deemed to have
                                              shared power to vote these shares.

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,219,152

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.49%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>


<TABLE>
<CAPTION>
<S>                                                                            <C>
- ----------------------------------------------------------                     --------------------------------------
CUSIP NO. 006867 10 5                                             13 G                  Page 8 of 14 Pages
- ----------------------------------------------------------                     --------------------------------------

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

1            NAME OF REPORTING
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON
                      Mark Gorenberg ("Gorenberg")
                      Tax ID Number:

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

2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a)   [ ]           (b)   [X]

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

3            SEC USE ONLY

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION

             U.S. Citizen

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

               NUMBER OF             5        SOLE VOTING POWER
                SHARES                        0 shares
             BENEFICIALLY
        OWNED BY EACH REPORTING      -------- ------------------------------------------------------------------------
                PERSON
                 WITH                6        SHARED VOTING POWER

                                              1,219,152 shares, of which 1,170,388 are directly owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA. Gorenberg, a member of HWEP II, may be deemed to have
                                              shared power to vote these shares.

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

                                     7        SOLE DISPOSITIVE POWER

                                              0 shares

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

                                     8        SHARED DISPOSITIVE POWER

                                              1,219,152  shares,  of which  1,170,388  are  directly  owned by HWVP II,
                                              41,450 shares are directly owned by HWTF II and 7,314 shares are directly
                                              owned by HWTF IIA. Gorenberg,  a member of HWEP II, may be deemed to have
                                              shared power to vote these shares.

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

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,219,152

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

10           CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9)
             EXCLUDES CERTAIN SHARES*                                                               [ ]

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    7.49%

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

12           TYPE OR REPORTING PERSON*

                                                                                                    IN
- ----------- ---------------------------------------------------------------------------------------------------------
<FN>

                           *   SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>


<PAGE>

- -----------------------------------                     ------------------------
CUSIP NO. 006867 10 5                      13 G             Page 9 of 14 Pages
- -----------------------------------                     ------------------------

ITEM 1(A).        NAME OF ISSUER

                  AdForce, Inc.

ITEM 1(B).        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES

                  10101 North De Anza Boulevard, Suite 210
                  Cupertino, California 95014

ITEM 2(A).        NAME OF PERSONS FILING

                  This Statement is filed by Hummer Winblad Partners II, L.P., a
                  Delaware  limited  partnership  ("HWVP  II"),  Hummer  Winblad
                  Technology  Fund IIA, a Delaware  limited  partnership  ("HWTF
                  IIA"),  Hummer  Winblad  Technology  Fund,  L.P.,  a  Delaware
                  limited   partnership   ("HWTF  II"),  Hummer  Winblad  Equity
                  Partners II, L.P., a Delaware limited liability company ("HWEP
                  II"), John R. Hummer  ("Hummer"),  Ann L. Winblad  ("Winblad")
                  and Mark Gorenberg  ("Gorenberg").  The foregoing entities and
                  individuals  are  collectively  referred to as the  "Reporting
                  Persons."

                  HWEP II is the  general  partner of HWVP II,  HWTF II and HWTF
                  IIA, and may be deemed to have indirect  beneficial  ownership
                  of shares of the issuer directly owned by HWVP II and HWTF II.
                  Hummer,  Winblad and  Gorenberg are members of HWEP II and may
                  be deemed to have indirect  beneficial  ownership of shares of
                  the issuer directly owned by HWVP II, HWTF II and HWTF IIA.

ITEM 2(B).        ADDRESS OF PRINCIPAL OFFICE

                  The address for each of the Reporting Persons is:

                  Hummer Winblad Venture Partners
                  2 South Park, 2nd Floor
                  San Francisco, California  94107

ITEM 2(C)         CITIZENSHIP

                  HWVP  II,   HWTF  II  and  HWTF  IIA  are   Delaware   limited
                  partnerships. HWEP II is a Delaware limited liability company.
                  Hummer, Winblad and Gorenberg are United States citizens.

ITEM 2(D) AND (E). TITLE OF CLASS OF SECURITIES AND CUSIP NUMBER

                  Common Stock
                  CUSIP # 006867 10 5

ITEM 3.           Not Applicable


<PAGE>

- -----------------------------------                     ------------------------
CUSIP NO. 006867 10 5                      13 G             Page 10 of 14 Pages
- -----------------------------------                     ------------------------

ITEM 4.           OWNERSHIP

                  The following information with respect to the ownership of the
                  Common  Stock  of  the  issuer  by  the  persons  filing  this
                  Statement is provided as of December 31, 1999:

                      (a) Amount beneficially owned:

                           See Row 9 of cover page for each Reporting Person.

                      (b) Percent of Class:

                           See Row 11 of cover page for each Reporting Person.

                      (c) 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.


<PAGE>

- -----------------------------------                     ------------------------
CUSIP NO. 006867 10 5                      13 G           Page 11 of 14 Pages
- -----------------------------------                     ------------------------

ITEM 5.           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

                  Not applicable.

ITEM 6.           OWNERSHIP  OF MORE THAN  FIVE  PERCENT  ON  BEHALF OF  ANOTHER
                  PERSON.

                                    Under certain circumstances set forth in the
                  limited  partnership  agreements of HWVP II, HWTF II, and HWTF
                  IIA and the limited  liability  company  agreement of HWEP II,
                  the general and limited  partners or members,  as the case may
                  be, of each of such  entities  may be deemed to have the right
                  to receive  dividends  from, or the proceeds from, the sale of
                  shares of the issuer  owned by each such  entity of which they
                  are a partner.

ITEM 7.           IDENTIFICATION  AND  CLASSIFICATION  OF THE  SUBSIDIARY  WHICH
                  ACQUIRED THE SECURITY  BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY

                  Not applicable.

ITEM 8.           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

                  Not applicable

ITEM 9.           NOTICE OF DISSOLUTION OF GROUP.

                  Not applicable

ITEM 10.          CERTIFICATION.

                  Not applicable


<PAGE>

- -----------------------------------                     ------------------------
CUSIP NO. 006867 10 5                      13 G             Page 12 of 14 Pages
- -----------------------------------                     ------------------------

                                   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:  February 10, 2000

                                        /s/ John R. Hummer
                                        ----------------------------------------
                                        John  R.  Hummer,  individually,  and on
                                        behalf of HWVP II, in his  capacity as a
                                        managing  member of HWEP II, the general
                                        partner  of HWVP II,  on  behalf of HWTF
                                        II, in his capacity as a managing member
                                        of HWEP II, the general  partner of HWTF
                                        II,  on  behalf  of  HWTF  IIA,  in  his
                                        capacity as managing  member of HWEP II,
                                        the general  partner of HWTF IIA, and on
                                        behalf of HWEP II in his  capacity  as a
                                        managing member thereof.

                                        /s/ Ann L. Winblad
                                        ----------------------------------------
                                        Ann L. Winblad

                                        /s/ Mark Gorenberg
                                        ----------------------------------------
                                        Mark Gorenberg


<PAGE>

- -----------------------------------                     ------------------------
CUSIP NO. 006867 10 5                      13 G             Page 13 of 14 Pages
- -----------------------------------                     ------------------------



                                  EXHIBIT INDEX

                                                              Found on
                                                            Sequentially
Exhibit                                                     Numbered Page
- -------                                                     -------------

Exhibit A:  Agreement of Joint Filing                            14





<PAGE>

- -----------------------------------                     ------------------------
CUSIP NO. 006867 10 5                      13 G             Page 14 of 14 Pages
- -----------------------------------                     ------------------------




                                    EXHIBIT A

                            Agreement of Joint Filing

                  The  undersigned  hereby agree that a single  Schedule 13G (or
any amendment  thereto)  relating to the Common Stock of AdForce,  Inc. shall be
filed on behalf of each of the  undersigned  and that  this  Agreement  shall be
filed as an exhibit to such Schedule 13G.

Date:  February 10, 2000

                                        /s/ John R. Hummer
                                        ----------------------------------------
                                        John  R.  Hummer,  individually,  and on
                                        behalf of HWVP II, in his  capacity as a
                                        managing  member of HWEP II, the general
                                        partner  of HWVP II,  on  behalf of HWTF
                                        II, in his capacity as a managing member
                                        of HWEP II, the general  partner of HWTF
                                        II,  on  behalf  of  HWTF  IIA,  in  his
                                        capacity as managing  member of HWEP II,
                                        the general  partner of HWTF IIA, and on
                                        behalf of HWEP II in his  capacity  as a
                                        managing member thereof.

                                        /s/ Ann L. Winblad
                                        ----------------------------------------
                                        Ann L. Winblad

                                        /s/ Mark Gorenberg
                                        ----------------------------------------
                                        Mark Gorenberg



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