ACCEL IV LP ET AL
SC 13G/A, 1999-02-16
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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. 1)*



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


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


                                   75605L 10 4
- --------------------------------------------------------------------------------
                                 (CUSIP Number)


                                December 31, 1998
- --------------------------------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

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

             [ ]     Rule 13d-1(b)

             [ ]     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 18 Pages

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 2 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel IV L.P. ("A IV")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          1,474,030 shares,  except that A IV Assoc., the general partner of A IV, 
           BENEFICIALLY                       and Breyer, Evnin, Hill, Klingenstein,  Patterson, Sednaoui, Swartz, and 
          OWNED BY EACH                       SFP,  the general  partners of A IV Assoc.,  may share voting power with 
             REPORTING                        respect to such shares.                                                  
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              See reponse to row 5.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              1,474,030 shares,  except that A IV Assoc., the general partner of A IV,
                                              and Breyer, Evnin, Hill, Klingenstein,  Patterson, Sednaoui, Swartz, and
                                              SFP, the general partners of A IV Assoc.,  may share  dispositive  power
                                              with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,474,030
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    4.9%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 3 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Keiretsu L.P. ("AKTSU")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          30,547  shares,  except  that AP&C,  the general  partner of AKTSU,  and 
           BENEFICIALLY                       Breyer,  Evnin,  Hill,  Patterson,  Sednaoui and Swartz, the officers of 
          OWNED BY EACH                       AP&C,  may be deemed to have shared  voting  power with  respect to such 
             REPORTING                        shares.                                                                  
              PERSON                                                                                                   
               WITH                                                                                                    
                                     -------- ------------------------------------------------------------------------

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

                                     7        SOLE DISPOSITIVE POWER
                                              30,547  shares,  except  that AP&C,  the general  partner of AKTSU,  and
                                              Breyer,  Evnin,  Hill,  Patterson,  Sednaoui and Swartz, the officers of
                                              AP&C,  may be deemed to have shared  dispositive  power with  respect to
                                              such shares.

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

                                     8        SHARED DISPOSITIVE POWER 
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       30,547
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.1%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 4 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Investors '95 L.P. ("AI95")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          61,241 shares, except that Breyer, Evnin, Hill, Klingenstein, Patterson,   
           BENEFICIALLY                       Sednaoui and Swartz, the general partners of AI95, may be deemed to have   
           OWNED BY EACH                      shared voting power with respect to such shares.                           
             REPORTING                        
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

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

                                     7        SOLE DISPOSITIVE POWER
                                              61,241 shares, except that Breyer, Evnin, Hill, Klingenstein, Patterson,
                                              Sednaoui and Swartz, the general partners of AI95, may be deemed to have
                                              shared dispositive power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       61,241
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.2%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 5 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel IV Associates L.P. ("A IV Assoc.")

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

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

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

                                     6        SHARED VOTING POWER
                                              1,474,030  shares, of which 1,474,030 are shares directly owned by A IV.
                                              A IV Assoc.  is the  general  partner  of A IV and may be deemed to have
                                              shared voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,474,030  shares, of which 1,474,030 are shares directly owned by A IV.
                                              A IV Assoc.  is the  general  partner  of A IV and may be deemed to have
                                              shared dispositive power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,474,030
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    4.9%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                         *SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 6 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Swartz Family Partnership L.P. ("SFP")

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

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

4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      Delaware
- ------------ ---------------------------------------------------------------------------------------------------------

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

                                     6        SHARED VOTING POWER
                                              1,474,030  shares, of which 1,474,030 are shares directly owned by A IV.
                                              SFP is a general  partner of A IV Assoc.,  the general  partner of A IV,
                                              and may be deemed to have  shared  voting  power  with  respect  to such
                                              shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,474,030  shares, of which 1,474,030 are shares directly owned by A IV.
                                              SFP is a general  partner of A IV Assoc.,  the general  partner of A IV,
                                              and may be deemed to have shared  dispositive power with respect to such
                                              shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,474,030
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    4.9%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 7 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Partners & Co. Inc. ("AP&C")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          189 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              30,547  shares,  all of which are directly  owned by AKTSU.  AP&C is the
                                              general  partner of AKTSU and may be deemed to have shared  voting power
                                              with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              189 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              30,547  shares,  all of which are directly  owned by AKTSU.  AP&C is the
                                              general  partner of AKTSU and may be deemed to have shared  voting power
                                              with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       30,736
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.1%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    CO
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 8 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Investors '93 L.P. ("AI93")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          7,170  shares,  except  that  Breyer,  Evnin,  Klingenstein,  Patterson, 
           BENEFICIALLY                       Sednaoui and Swartz, the general partners of AI93, may be deemed to have 
           OWNED BY EACH                      shared voting power with respect to such shares.                         
             REPORTING                                                                                                 
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

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

                                     7        SOLE DISPOSITIVE POWER
                                              7,170  shares,  except  that  Breyer,  Evnin,  Klingenstein,  Patterson,
                                              Sednaoui and Swartz, the general partners of AI93, may be deemed to have
                                              shared dispositive power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       7,170
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.0%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                   Page 9 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Accel Japan L.P. ("AJ")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          15,502 shares, except that Breyer, Klingenstein, Patterson, Sednaoui and 
           BENEFICIALLY                       Swartz,  the general partners of AJ, may be deemed to have shared voting 
           OWNED BY EACH                      power with respect to such shares.                                       
             REPORTING                                                                                                 
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

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

                                     7        SOLE DISPOSITIVE POWER
                                              15,502 shares, except that Breyer, Klingenstein, Patterson, Sednaoui and
                                              Swartz,  the  general  partners  of AI93,  may be deemed to have  shared
                                              dispositive power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              See response to row 7.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       15,502
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    0.1%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    PN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 10 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      James W. Breyer ("Breyer")
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]           (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          39,426 shares
           BENEFICIALLY
           OWNED BY EACH 
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Breyer may be deemed to have shared  voting  power with  respect to such
                                              shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              39,426 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Breyer may be deemed to have shared  dispositive  power with  respect to
                                              such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,628,105
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                        5.4%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*                                                              IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 11 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Luke B. Evnin ("Evnin")
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]           (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          11,387
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,573,177  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are shares directly owned by AI93 and 189 of which
                                              are shares  directly  owned by AP&C.  Evnin may be deemed to have shared
                                              voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              11,387
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,573,177  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by  AI95,  7,170  are  shares  directly  owned by AI93 and 189 are
                                              shares  directly  owned by AP&C.  Evnin  may be  deemed  to have  shared
                                              dispositive power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,584,564
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    5.3%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 12 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Eugene D. Hill, III ("Hill")
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]           (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          4,613 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,566,007  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95, and 189 are shares  directly owned by AP&Co.  Hill may be
                                              deemed to have shared voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              4,613 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,566,007  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95, and 189 are shares  directly owned by AP&Co.  Hill may be
                                              deemed to have shared dispositive power with respect to such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,570,620
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    5.2%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 13 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Paul H. Klingenstein ("Klingenstein")

- ------------ ---------------------------------------------------------------------------------------------------------
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                          22,774 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,557,943  shares, of which 1,474,030 are shares directly owned by A IV,
                                              61,241 of which are directly owned by AI95,  7,170 are owned directly by
                                              AI93 and 15,502 of which are directly owned by AJ.  Klingenstein  may be
                                              deemed to have shared voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              22,774 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,557,943  shares, of which 1,474,030 are shares directly owned by A IV,
                                              61,241 of which are directly owned by AI95,  7,170 are owned directly by
                                              AI93 and 15,502 of which are directly owned by AJ.  Klingenstein  may be
                                              deemed to have shared dispositive power with respect to such shares.
- ------------ ---------------------------------------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,580,717
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
                                                                                                    5.2%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*
                                                                                                    IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        * SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 14 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      Arthur C. Patterson ("Patterson")
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]           (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          88,069  shares,  of which 56,482 shares are directly owned by Ellmore C.  
            BENEFICIALLY                      Patterson  Partners  ("ECPP").  Patterson is the general partner of ECPP  
           OWNED BY EACH                      and may be deemed to have sole voting power with respect to such shares.  
             REPORTING                                                                                                  
              PERSON                          
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Patterson may be deemed to have shared voting power with respect to such
                                              shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              88,069  shares,  of which  56,482  shares  are  directly  owned by ECPP.
                                              Patterson is the general  partner of ECPP and may be deemed to have sole
                                              voting power with respect to such shares.
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Patterson may be deemed to have shared dispositive power with respect to
                                              such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,676,748
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                        5.6%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*                                                              IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 15 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      G. Carter Sednaoui ("Sednaoui")
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]           (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

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

                                     6        SHARED VOTING POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Sednaoui may be deemed to have shared  voting power with respect to such
                                              shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              0 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Sednaoui may be deemed to have shared  dispositive power with respect to
                                              such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,588,679
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                        5.3%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*                                                              IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

<TABLE>
<CAPTION>
- ----------------------------------------------------------                    ---------------------------------------
CUSIP NO. 75605L 10 4                                            13 G                  Page 16 of 18 Pages
- ----------------------------------------------------------                    ---------------------------------------
<S>           <C>                                                                  <C>                <C>  
- ------------ ---------------------------------------------------------------------------------------------------------
1            NAME OF REPORTING PERSONS
             SS OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS
                      James R. Swartz ("Swartz")
- ------------ ---------------------------------------------------------------------------------------------------------
2            CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                                    (a) [ ]           (b) [X]
- ------------ ---------------------------------------------------------------------------------------------------------

3            SEC USE ONLY
- ------------ ---------------------------------------------------------------------------------------------------------
4            CITIZENSHIP OR PLACE OF ORGANIZATION
                      U.S. Citizen
- ------------ ---------------------------------------------------------------------------------------------------------

             NUMBER OF               5        SOLE VOTING POWER
              SHARES                          2,163 shares
           BENEFICIALLY
           OWNED BY EACH
             REPORTING
              PERSON
               WITH
                                     -------- ------------------------------------------------------------------------

                                     6        SHARED VOTING POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Swartz may be deemed to have shared  voting  power with  respect to such
                                              shares.
                                     -------- ------------------------------------------------------------------------

                                     7        SOLE DISPOSITIVE POWER
                                              2,163 shares
                                     -------- ------------------------------------------------------------------------

                                     8        SHARED DISPOSITIVE POWER
                                              1,588,679  shares, of which 1,474,030 are shares directly owned by A IV,
                                              30,547 are shares  directly owned by AKTSU,  61,241 are shares  directly
                                              owned by AI95,  7,170 are  shares  directly  owned by AI93,  15,502  are
                                              shares  directly owned by AJ, and 189 are shares directly owned by AP&C.
                                              Swartz may be deemed to have shared  dispositive  power with  respect to
                                              such shares.
- ------------------------------------ -------- ------------------------------------------------------------------------

9            AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH
             REPORTING PERSON                                                                       1,590,842
- ------------ ---------------------------------------------------------------------------------------------------------

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

11           PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9                                        5.3%
- ------------ ---------------------------------------------------------------------------------------------------------

12           TYPE OF REPORTING PERSON*                                                              IN
- ------------ ---------------------------------------------------------------------------------------------------------
<FN>
                                        o SEE INSTRUCTIONS BEFORE FILLING OUT!
</FN>
</TABLE>

<PAGE>

                  This  statement  amends the Statement on Schedule 13G filed by
                  Accel IV L.P.("A IV"), Accel Japan L.P. ("AJ"), Accel Keiretsu
                  L.P.("AKTSU"),   Accel  Investors  `93  L.P.  ("AI93"),  Accel
                  Investors `95 L.P.  ("AI95"),  Accel IV Associates L.P. ("A IV
                  Assoc."),  Accel Partners & Co., Inc. ("AP&C"),  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")  (collectively referred to as the "Reporting
                  Persons").  Only  those  Items  as to which  there  has been a
                  change of information are included in this Amendment.

ITEM 2(b).        ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

                  The address of the  principal  business  office of each of the
                  Reporting Persons is:

                  428 University Avenue
                  Palo Alto, CA 94301

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, 1998:

                      (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>



                                   SIGNATURES
                                   ----------

                  After  reasonable  inquiry and to the best of my knowledge and
belief,  I certify  that the  information  set forth in this  statement is true,
complete and correct.

Dated:  February 12, 1999

Entities:

Accel IV L.P.
Accel Japan L.P.
Accel Keiretsu L.P.
Accel Investors '93 L.P.
Accel Investors '95 L.P.             By: /s/  G. Carter Sednaoui
Accel IV Associates L.P.                 ------------------------------------
Swartz Family Partnership L.P.           G. Carter Sednaoui, Attorney-in-fact 
                                         for above-listed entities            
                                         

Individuals:  

James W. Breyer
Luke B. Evnin
Eugene D. Hill, III
Paul H. Klingenstein
Arthur C. Patterson                  By: /s/  G. Carter Sednaoui
G. Carter Sednaoui                       ---------------------------------------
James R. Swartz                          G. Carter Sednaoui, Individually and as
                                         Attorney-in-fact for above-listed      
                                         individuals                            
                                                                                
                                         


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