MAYFIELD VI INVESTMENT PARTNERS
SC 13G/A, 1997-02-19
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                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549


                                  SCHEDULE 13G


                   UNDER THE SECURITIES EXCHANGE ACT OF 1934

                               (AMENDMENT NO. 1)*


                              CITRIX SYSTEMS, INC.
- -------------------------------------------------------------------------------
                                (NAME OF ISSUER)


                                  COMMON STOCK
- -------------------------------------------------------------------------------
                         (TITLE OF CLASS OF SECURITIES)


                                   177376100
- -------------------------------------------------------------------------------
                                 (CUSIP NUMBER)


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

The information required in 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).





SEC 1745 (2-95)


<PAGE>   2
CUSIP NO. 177376100                        SCHEDULE 13G       
         ---------------------                        

  (1)     NAMES OF REPORTING PERSONS                 
          S.S. OR I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS                

          MAYFIELD VI, INVESTMENT PARTNERS, a California Limited Partnership
          94-3060511
          ---------------------------------------------------------------------

  (2)     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (A)   [ ]
                                                                    (B)   [x]

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

  (3)     SEC USE ONLY

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

  (4)     CITIZENSHIP OR PLACE OF ORGANIZATION                      

          CALIFORNIA
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    N/A - SEE ITEM 5
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     N/A - SEE ITEM 5
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   N/A - SEE ITEM 5
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               N/A - SEE ITEM 5
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

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

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          
          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*

          PN
          ---------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT!


<PAGE>   3
CUSIP NO. 177376100                                 13G       
         ---------------------                        

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

          Mayfield Associates Fund, a California Limited Partnership
          94-3062897
          ---------------------------------------------------------------------

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

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

  (3)     SEC USE ONLY

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

  (4)     CITIZENSHIP OR PLACE OF ORGANIZATION                      

          California
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    N/A - SEE ITEM 5
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     N/A - SEE ITEM 5
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   N/A - SEE ITEM 5
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               N/A - SEE ITEM 5
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

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

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          
          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*

          PN
          ---------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT


<PAGE>   4
CUSIP NO. 177376100                                 13G       
         ---------------------                        

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

          F. Gibson Myers, Jr.
          ---------------------------------------------------------------------

  (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.          
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    N/A - SEE ITEM 5
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     N/A - SEE ITEM 5
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   N/A - SEE ITEM 5
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               N/A - SEE ITEM 5
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

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

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          
          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*

          IN
          ---------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT


<PAGE>   5
CUSIP NO. 177376100                        13G       
         ---------------------                        
                                      
  (1)     NAME OF REPORTING PERSON                 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON                

          Kevin A. Fong             
          ---------------------------------------------------------------------

  (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.          
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    N/A - SEE ITEM 5
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     N/A - SEE ITEM 5
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   N/A - SEE ITEM 5
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               N/A - SEE ITEM 5
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

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

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          
          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*

          IN
          ---------------------------------------------------------------------
                      *SEE INSTRUCTION BEFORE FILLING OUT


<PAGE>   6
CUSIP NO. 177376100                         13G       
         ---------------------                        

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

          William D. Unger     
          ---------------------------------------------------------------------

  (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.          
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    N/A - SEE ITEM 5
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     N/A - SEE ITEM 5
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   N/A - SEE ITEM 5
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               N/A - SEE ITEM 5
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

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

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          
          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*

          IN
          ---------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT


<PAGE>   7
CUSIP NO. 177376100                        13G       
         ---------------------                        

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

          Wendell G. Van Auken, III
          ---------------------------------------------------------------------

  (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.          
          ---------------------------------------------------------------------

                       (5)     SOLE VOTING POWER                    
  NUMBER OF                    N/A - SEE ITEM 5
   SHARES              --------------------------------------------------------
 BENEFICIALLY          (6)     SHARED VOTING POWER                  
  OWNED BY                     N/A - SEE ITEM 5
    EACH               --------------------------------------------------------
  REPORTING            (7)     SOLE DISPOSITIVE POWER               
 PERSON WITH                   N/A - SEE ITEM 5
                       --------------------------------------------------------
                       (8)     SHARED DISPOSITIVE POWER             
                               N/A - SEE ITEM 5
                       --------------------------------------------------------

  (9)     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON         

          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

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

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

 (11)     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9           
          
          N/A - SEE ITEM 5
          ---------------------------------------------------------------------

 (12)     TYPE OF REPORTING PERSON*

          IN
          ---------------------------------------------------------------------
                    *SEE INSTRUCTION BEFORE FILLING OUT


<PAGE>   8


ITEM 1.
         (a)     Name of Issuer:

                 Citrix Systems, Inc.


         (b)     Address of Issuer's Principal Executive Offices:

                 210 University Drive, #700
                 Coral Springs, FL 33071

ITEM 2.
         (a)     Name of Person(s) Filing:

                 Mayfield VI Investment Partners, a California Limited
                 Partnership 
                 Mayfield Associates Fund, a California Limited
                 Partnership
                 F. Gibson Myers, Jr.
                 Kevin A. Fong                     William D. Unger
                 Wendell G. Van Auken, III

         (b)     Address of Principal Office:

                 The entities and individuals listed in Item 2(a) share the
                 following business address:

                 The Mayfield Fund
                 2800 Sand Hill Road
                 Menlo Park, CA 94025

         (c)     Citizenship:

                 The entities listed in Item 2(a) are California Limited
                 Partnerships.  The individuals listed in Item 2(a) are U.S.
                 citizens.

         (d)     Title of Class of Securities:

                 Common Stock

         (e)     CUSIP Number: 177376100



ITEM 3.  IF THIS STATEMENT IS FILED PURSUANT TO RULE 13d-1(b), OR 13d-2(b),
         CHECK WHETHER THE PERSON IS A:

         (a)     [ ]      Broker or Dealer registered under Section 15 of the
                          Act

         (b)     [ ]      Bank as defined in section 3(a)(6) of the Act

         (c)     [ ]      Insurance Company as defined in section 3(a)(19) of
                          the Act

         (d)     [ ]      Investment Company registered under section 8 of the
                          Investment Company Act



<PAGE>   9



         (e)     [ ]      Investment Adviser registered under section 203 of
                          the Investment Advisers Act of 1940

         (f)     [ ]      Employee Benefit Plan, Pension Fund which is subject
                          to the provisions of the Employee Retirement Income
                          Security Act of 1974 or Endowment Fund, see Section
                          240.13d-1(b)(1)(ii)(F)

         (g)     [ ]      Parent Holding Company, in accordance with Section
                          240.13d-1(b)(ii)(G) (Note: See Item 7)

         (h)     [ ]      Group, in accordance with Section
                          240.13d-1(b)(1)(ii)(H)



                 N/A



ITEM 4.  OWNERSHIP

         The information regarding ownership as set forth in Items 5-9 of Pages
2-7 hereto, is hereby incorporated by reference.

 .


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

         If this statement is being filed to report the fact that as of the
date hereof the reporting person has ceased to be the beneficial owner of more
than five percent of the class securities, check the following  [x]

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

         N/A


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

         N/A

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

         N/A

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP

         N/A

ITEM 10. CERTIFICATION


         N/A
<PAGE>   10



                                   SIGNATURE



         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.





                                                February 14, 1997
                                         --------------------------------------
                                                      Date




                                MAYFIELD VI INVESTMENT PARTNERS,
                                A California Limited Partnership


                                By:   /s/ George A. Pavlov
                                      ------------------------------------------
                                      George A. Pavlov, Authorized Signatory



                                MAYFIELD ASSOCIATES FUND,
                                A California Limited Partnership


                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      George A. Pavlov, Authorized Signatory


                                F. GIBSON MYERS, JR.


                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      George A. Pavlov, Attorney In Fact



                                KEVIN A. FONG


                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      George A. Pavlov, Attorney In Fact

 
                                WILLIAM D. UNGER
 

                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      George A. Pavlov, Attorney In Fact


                                WENDELL G. VAN AUKEN, III


                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      George A. Pavlov, Attorney In Fact

<PAGE>   11

EXHIBITS



A-Statement Appointing Designated Filer and Authorized Signatory














<PAGE>   12

                                   EXHIBIT A

         STATEMENT APPOINTING DESIGNATED FILER AND AUTHORIZED SIGNATORY


         Each of the undersigned entities and individuals (collectively, the
"Reporting Persons") hereby designates the entity listed in Column II of
EXHIBIT A hereto, or such other person or entity as is designated in writing by
George A. Pavlov (any such entity is referred to as the "Designated Filer") as
the beneficial owner to make filings of Schedules 13D and 13G (and any
amendments thereto) pursuant to Section 13(d) of the Securities Exchange Act of
1934 (the "Exchange Act") and of Forms 3, 4 and 5 (and any amendments thereto)
pursuant to Section 16(a) of the Exchange Act (collectively, the "Reports")
with respect to the securities of the entities listed in Column I of EXHIBIT A
hereto and with respect to the securities of any other entity whose securities
are now, or hereafter become, publicly traded and whose securities are
beneficially owned (directly or indirectly) both by such Reporting Person and
by such Designated Entity (collectively, the "Companies").

         Each Reporting Person hereby further authorizes and designates GEORGE
A. PAVLOV   (the "Authorized Signatory") to execute and file on behalf of such
Reporting Person the Reports with respect to the securities of the Companies,
including all Schedules 13D and 13G and Forms 3, 4 and 5, and any amendments
thereto, that the Reporting Person may be required to file with the United
States Securities and Exchange Commission as a result of the Reporting Person's
ownership of, or transactions in securities of the Companies.

         The authority of the Designated Filer and the Authorized Signatory
under this document with respect to each Reporting Person shall continue until
such Reporting Person is no longer required to file Schedules 13D or 13G or
Forms 3, 4 and 5 with respect to the Reporting Person's ownership of, or
transactions in, the securities of the Companies, unless earlier revoked in
writing.  Each Reporting Person acknowledges that the Designated Filer and the
Authorized Signatory are not assuming any of the Reporting Person's
responsibilities to comply with Section 13(d) or Section 16 of the Exchange
Act.

Date: February 10, 1997         MAYFIELD IV,
                                a California Limited Partnership

                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997         MAYFIELD V,
                                a California Limited Partnership

                                By:   /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


<PAGE>   13

Date: February 10, 1997         MAYFIELD VI INVESTMENT PARTNERS,
                                a California Limited Partnership


                               By:     Mayfield VI Management Partners,
                                       a California Limited Partnership,
                                       Its General Partner


                               By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997        MAYFIELD VI MANAGEMENT PARTNERS,
                               a California Limited Partnership


                               By:    /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997        MAYFIELD VII
                               a California Limited Partnership

                               By:    Mayfield VII Management Partners,
                                      a California Limited Partnership,
                                      Its General Partner


                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997               MAYFIELD VII MANAGEMENT PARTNERS,
                                      a California Limited Partnership



                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory
<PAGE>   14
Date: February 10, 1997               MAYFIELD VIII,
                                      a California Limited Partnership

                              By:     Mayfield VIII Management, L.L.C.,
                                      Its General Partner


                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997               MAYFIELD VIII MANAGEMENT, L.L.C.,
                                      a Delaware Limited Liability Company



                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997               MAYFIELD SOFTWARE PARTNERS,
                                      a California Partnership

                              By:     Mayfield VI Investment Partners,
                                      a California Limited Partnership,
                                      Its General Partner

                              By:     Mayfield VI Management Partners,
                                      a California Limited Partnership,
                                      Its General Partner


                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


<PAGE>   15

Date: February 10, 1997       MAYFIELD SOFTWARE TECHNOLOGY PARTNERS,
                              a California Partnership

                              By:     Mayfield VI Investment Partners,
                                      a California Limited Partnership,
                                      Its General Partner

                              By:     Mayfield VI Management Partners,
                                      a California Limited Partnership,
                                      Its General Partner


                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997       MAYFIELD MEDICAL PARTNERS,
                              a California Partnership

                              By:     Mayfield VI Investment Partners,
                                      a California Limited Partnership,
                                      Its General Partner

                              By:     Mayfield VI Management Partners,
                                      a California limited partnership,
                                      Its General Partner


                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997       MAYFIELD MEDICAL PARTNERS 1992,
                              a California Partnership



<PAGE>   16

                              By:     Mayfield VII,
                                      a California Limited Partnership,
                                      Its General Partner

                              By:     Mayfield VII Management Partners,
                                      a California limited partnership,
                                      Its General Partner


                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory


Date: February 10, 1997       MAYFIELD ASSOCIATES FUND,
                              a California Limited Partnership



                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory




Date: February 10, 1997       MAYFIELD ASSOCIATES FUND II,
                              a California Limited Partnership



                              By:     /s/ George A. Pavlov
                                      -----------------------------------------
                                      Authorized Signatory

<PAGE>   17

Date: February 10, 1997               /s/ Yogen K. Dalal
                                      -----------------------------------------
                                      YOGEN K. DALAL


Date: February 10, 1997               /s/ Kevin A. Fong
                                      -----------------------------------------
                                      KEVIN A. FONG


Date: February 10, 1997               /s/ A. Grant Heidrich, III
                                      -----------------------------------------
                                      A. GRANT HEIDRICH III


Date: February 10, 1997               /s/ Russell C. Hirsch
                                      -----------------------------------------
                                      RUSSELL C. HIRSCH


Date: February 10, 1997               /s/ Wende S. Hutton
                                      -----------------------------------------
                                      WENDE S. HUTTON


Date: February 10, 1997               /s/ Michael J. Levinthal
                                      -----------------------------------------
                                      MICHAEL J. LEVINTHAL


Date: February 10, 1997               /s/ F. Gibson Myers, Jr.
                                      -----------------------------------------
                                      F. GIBSON MYERS, JR.


Date: February 10, 1997               /s/ William D. Unger
                                      -----------------------------------------
                                      WILLIAM D. UNGER


Date: February 10, 1997               /s/ Wendell G. Van Auken, III
                                      -----------------------------------------
                                      WENDELL G. VAN AUKEN III


<PAGE>   18


                                   EXHIBIT A
                              TO EXHIBIT A OF 13G

<TABLE>
<CAPTION>
 COLUMN I                                     COLUMN II                        PERSONS/ENTITIES ON WHOSE BEHALF
 --------                                     ---------                        --------------------------------
 PUBLICLY TRADED COMPANY                      DESIGNATED FILER                 THE DESIGNATED FILER MAY ACT
 -----------------------                      ----------------                 ----------------------------
 <S>                                          <C>                              <C>
 ADVENT SOFTWARE, INC.                        MAYFIELD VII                     MAYFIELD VII MANAGEMENT PARTNERS,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               YKD, FGM, KAF, WDU, WVA, MJL, AGH

 BROADVISION, INC.                            MAYFIELD VII                     MAYFIELD VII MANAGEMENT PARTNERS,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               YKD, KAF, MJL

 DIGITAL GENERATION SYSTEMS, INC.             MAYFIELD VII                     MAYFIELD VII MANAGEMENT PARTNERS,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               YKD, KAF, WDU, WVA, MJL, AGH

 DIGITAL SYSTEMS INTERNATIONAL, INC.          MAYFIELD VI INVESTMENT           MAYFIELD VI MANAGEMENT PARTNERS,
                                              PARTNERS                         MAYFIELD VII,
                                                                               MAYFIELD ASSOCIATES FUND,
                                                                               MAYFIELD ASSOCIATES FUND II

 GYNECARE, INC.                               MAYFIELD VII                     MAYFIELD VII MANAGEMENT PARTNERS,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               YKD, FGM, KAF, WDU, MJL, AGH, WSH

 HEARTSTREAM, INC.                            MAYFIELD VII                     MAYFIELD VII MANAGEMENT PARTNERS,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               YKD, FGM, KAF, WDU, WVA, MJL, AGH, WSH

 INCONTROL, INC.                              MAYFIELD VI                      MAYFIELD VI MANAGEMENT PARTNERS,
                                              INVESTMENT PARTNERS              MAYFIELD MEDICAL PARTNERS,
                                                                               YKD, FGM, KAF, WDU, WVA, MJL, AGH

 MILLENNIUM PHARMACEUTICALS, INC.             MAYFIELD VII                     MAYFIELD VII MANAGEMENT PARTNERS,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               MAYFIELD MEDICAL PARTNERS 1992,
                                                                               YKD, FGM, KAF, WDU, WVA, MJL, AGH
</TABLE>

<PAGE>   19

<TABLE>
 <S>                                          <C>                              <C>
 PRISM SOLUTIONS, INC.                        MAYFIELD VI                      MAYFIELD VI MANAGEMENT PARTNERS,
                                              INVESTMENT PARTNERS              MAYFIELD ASSOCIATES FUND,
                                                                               MAYFIELD SOFTWARE TECHNOLOGY PARTNERS,
                                                                               YKD, FGM, KAF, WDU, WVA, MJL

 SPECTRALINK CORPORATION                      MAYFIELD VI                      MAYFIELD VI MANAGEMENT PARTNERS,
                                              INVESTMENT PARTNERS              MAYFIELD ASSOCIATES FUND,
                                                                               YKD

 ADEPT TECHNOLOGY, INC.                       MAYFIELD V                       MAYFIELD IV, AGH,WVA,WDU

 ARBOR SOFTWARE, INC.                         MAYFIELD VI                      MAYFIELD ASSOCIATES FUND,
                                              INVESTMENT PARTNERS              FGM, KAF, WDU

 CELERITEK                                    MAYFIELD V                       MAYFIELD V

 CITRIX SYSTEMS, INC.                         MAYFIELD VI                      MAYFIELD ASSOCIATES FUND,
                                              INVESTMENT PARTNERS              FGM, KAF, WVA, WDU

 DATALOGIX CORPORATION                        MAYFIELD VI INVESTMENT           MAYFIELD ASSOCIATES FUND,
                                              PARTNERS                         KAF, WDU

 INSITE VISION, INC.                          MAYFIELD V                       WDU

 PHARMACYCLICS, INC.                          MAYFIELD VII                     MAYFIELD ASSOCIATES FUND II

 PURE SOFTWARE, INC.                          MAYFIELD VI INVESTMENT           MAYFIELD SOFTWARE PARTNERS,
                                              PARTNERS                         MAYFIELD ASSOCIATES FUND,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               AGH

 SANDISK CORPORATION                          MAYFIELD VI INVESTMENT           MAYFIELD ASSOCIATES FUND,
                                              PARTNERS                         FGM, KAF, WDU

 THE VANTIVE CORPORATION                      MAYFIELD VI INVESTMENT           MAYFIELD ASSOCIATES FUND
                                              PARTNERS                         FGM, KAF, WVA, WDU

 VISIONEER, INC.                              MAYFIELD VII                     MAYFIELD ASSOCIATES FUND II,
                                                                               MAYFIELD SOFTWARE PARTNERS,
                                                                               YKD, FGM, KAF, WVA, WDU
</TABLE>


<PAGE>   20


<TABLE>
 <S>                                          <C>                              <C>
 VIVUS, INC.                                  MAYFIELD VI INVESTMENT           MAYFIELD VII,
                                              PARTNERS                         MAYFIELD ASSOCIATES FUND,
                                                                               MAYFIELD ASSOCIATES FUND II,
                                                                               YKD, FGM, KAF, WDU, WVA, MJL, AGH
</TABLE>



YKD= Yogen K. Dalal   FGM= F. Gibson Myers, Jr.       KAF= Kevin A. Fong
WDU= William D. Unger WVA= Wendell G. Van Auken III   MJL= Michael J. Levinthal
AGH= A. Grant Heidrich III  WSH= Wende S. Hutton




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