VIROPHARMA INC
SC 13G, 1997-02-14
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

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

                                  SCHEDULE 13G
                                 (RULE 13D-102)

             INFORMATION STATEMENT PURSUANT TO RULES 13D-1 AND 13D-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934

                          (AMENDMENT NO. ___________)*

                             VIROPHARMA INCORPORATED

                                (Name of Issuer)

                                     COMMON

                         (Title of Class of Securities)

                                   928241 10 8

                                 (CUSIP Number)



                  *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 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 or otherwise subject to the liabilities of that
section  of the Act but  shall be  subject  to all other  provisions  of the Act
(however, SEE the NOTES).


                               Page 1 of 18 Pages


<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  2  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           Sevin Rosen Fund IV L.P.
           75-2416757
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           Delaware
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                1,268,022
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 0
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              1,268,022
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              0

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           PN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 2 of 18 Pages


<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  3  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           SRB Associates IV L.P.
           75-2416758
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           Delaware
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                1,268,022
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 0
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              1,268,022
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              0

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           PN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 3 of 18 Pages


<PAGE>

- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  4  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           Jon W. Bayless
           ###-##-####
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           U.S.
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                -0-
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 1,268,022
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              -0-
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              1,268,022

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 4 of 18 Pages


<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  5  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           Stephen M. Dow
           ###-##-####
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           U.S.
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                14,000
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 1,268,022
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              14,000
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              1,268,022

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

           1,282,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.5%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 5 of 18 Pages


<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  6  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           Dennis J. Gorman
           ###-##-####
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           U.S.
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                0
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 1,268,022
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              0
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              1,268,022

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 6 of 18 Pages

<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  7  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           John V. Jaggers
           ###-##-####
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           U.S.
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                0
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 1,268,022
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              0
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              1,268,022

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 7 of 18 Pages


<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  8  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           Charles H. Phipps
           ###-##-####
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           U.S.
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                0
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 1,268,022
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              0
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              1,268,022

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           IN
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!


                               Page 8 of 18 Pages


<PAGE>


- ----------------------------------           ----------------------------------
CUSIP NO. 928241 10 8                 13G        PAGE  9  OF  18  PAGES
- -----------------------------------          ----------------------------------


- -------------------------------------------------------------------------------
1          NAMES OF REPORTING PERSONS
           S.S. OR I.R.S. IDENTIFICATIONS NOS. OF ABOVE PERSONS

           Sevin Rosen Bayless Management Company
           75-2185911
- -------------------------------------------------------------------------------
2          CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*         (a)  [   ]
                                                                     (b)  [   ]

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

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

           Texas
- -------------------------------------------------------------------------------

                     5        SOLE VOTING POWER
     NUMBER OF                0
      SHARES         ----------------------------------------------------------
   BENEFICIALLY      6        SHARED VOTING POWER
     OWNED BY                 1,268,022
       EACH          ----------------------------------------------------------
     REPORTING
    PERSON WITH      7        SOLE DISPOSITIVE POWER
                              0
                     ----------------------------------------------------------
                     8        SHARED DISPOSITIVE POWER
                              1,268,022

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

           1,268,022
- -------------------------------------------------------------------------------
10         CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES
           CERTAIN SHARES*                                               |_|

- -------------------------------------------------------------------------------
11         PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)

           14.4%
- -------------------------------------------------------------------------------
12         TYPE OF REPORTING PERSON*

           CO
- -------------------------------------------------------------------------------

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!



                               Page 9 of 18 Pages


<PAGE>



Item 1.

          (a) NAME OF ISSUER.

          ViroPharma Incorporated, a Delaware corporation (the "Issuer").

          (b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES.

          The  Issuer's  principal  executive  offices  are  located at 76 Great
Valley Parkway, Malvern, Pennsylvania 19355.

ITEM 2.

          (a) NAMES OF PERSONS FILING.

          This statement is filed by the following persons: (i) Sevin Rosen Fund
IV   L.P.  ("SR IV");  (ii) SRB  Associates  IV L.P.  ("SRB  IV");  (iii) Jon W.
Bayless  ("Bayless");  (iv)  Stephen  M.  Dow  ("Dow");  (v)  Dennis  J.  Gorman
("Gorman"); (vi) John V. Jaggers ("Jaggers"); (vii) Charles H. Phipps ("Phipps")
and  (viii) Sevin Rosen Bayless Management Company ("Management Company").

          SRB IV is the general partner of SR IV. Bayless, Dow, Gorman,  Jaggers
and  Phipps  are  the  general  partners  of  SRB IV and  are  officers  of
Management  Company.  In addition,  Bayless is a holder of certain shares of the
Management Company's issued and outstanding capital stock.

          (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE.

          The  principal  business  office  of each of SR IV,  SRB IV,  Bayless,
Gorman, Jaggers, Phipps and Management Company is Two Galleria Tower, 13455 Noel
Road,Suite 1670,  Dallas,  Texas 75240. The principal  business office of Dow is
550  Lytton Avenue, Suite 200, Palo Alto, California 94301.


                               Page 10 of 18 Pages

<PAGE>



          (c) CITIZENSHIP.

          SR IV and SRB IV are each Delaware limited partnerships. Bayless, Dow,
Gorman, Jaggers and Phipps are each U.S. citizens. Management Company is a Texas
corporation.

          (d) TITLE OF CLASS OF SECURITIES.

     This statement relates to shares of Common Stock, par value $.002 per share
(the "Common Stock"), of the Issuer.

          (e) CUSIP NUMBER.

          928241 10 8

ITEM 3.

          This  statement  is not  being  filed  pursuant  to Rule  13d-1(b)  or
13d-2(b).

ITEM 4. OWNERSHIP.

          (a) AMOUNT BENEFICIALLY OWNED.

               (i)  SR IV beneficially  owns 1,268,022 shares of Issuer's Common
                    Stock.

               (ii) SRB IV beneficially owns 1,268,022 shares of Issuer's Common
                    Stock.

               (iii)Each of Bayless, Gorman, Jaggers, Phipps and Management
                    Company  beneficially  owns  1,268,022  shares  of  Issuer's
                    Common Stock.

               (iv) Dow beneficially owns 1,282,022 shares of Issuer's Common 
                    Stock.



                               Page 11 of 18 Pages

<PAGE>



          (b) PERCENT OF CLASS.1

               (i)  SR IV -- 14.4%.

               (ii) SRB IV -- 14.4%.

               (iii)Each of Bayless, Gorman, Jaggers, Phipps and Management
                    Company -- 14.4%.

               (iv) Dow -- 14.5%.

          (c)  POWER TO VOTE OR  DIRECT  THE  VOTE AND  DISPOSE  OR  DIRECT  THE
DISPOSITION OF SECURITIES.

               (i)  Each of SR IV and SRB IV has sole  power to vote or  dispose
                    or to  direct  the  vote or  disposition  of the  shares  of
                    Issuer's Common Stock.

               (ii) Each of Bayless, Gorman, Jaggers, Phipps and Management
                    Company has shared power to vote or dispose or to direct the
                    vote or disposition of the shares of Issuer's Common Stock.

               (iii)Dow  has sole power to vote or dispose or to direct the vote
                    or   disposition of 14,000 shares of Issuer's Common
                    Stock and has  shared  power to vote or dispose or to direct
                    the vote or  disposition  of  1,268,022  shares of  Issuer's
                    Common Stock.

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 of securities, check the following [ ]

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

          Not applicable.


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

1    According to the most recently  available  filing with the  Securities  and
     Exchange Commission in which such number is required to be indicated.


                               Page 12 of 18 Pages

<PAGE>



ITEM 7.  IDENTIFICATION  AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
         SECURITY  BEING  REPORTED  ON  BY  THE  PARENT  HOLDING  COMPANY.  Not
         applicable.

ITEM 8.  IDENTIFICATION  AND  CLASSIFICATION  OF  MEMBERS  OF  THE  GROUP.  Not
         applicable.

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP. Not applicable.

ITEM 10. CERTIFICATION. Not applicable.



                               Page 13 of 18 Pages
 
<PAGE>



                         SIGNATURE/SIGNED IN COUNTERPART

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

                                  SEVIN ROSEN FUND IV L.P.

                                  By: SRB Associates IV L.P.,
                                       General Partner


Dated:  February 13, 1997         By:/S/ JOHN V. JAGGERS
                                     ----------------------------------------
                                     John V. Jaggers, a General Partner


                                  SRB ASSOCIATES IV L.P.


Dated:  February 13, 1997         By: /S/ JOHN V. JAGGERS
                                      --------------------------------------
                                      John V. Jaggers, a General Partner



Dated:  February 13, 1997              /S/ JON W. BAYLESS
                                       -------------------------------------
                                           Jon W. Bayless


Dated:  February 13, 1997              /S/ JOHN V. JAGGERS, ATTORNEY-IN-FACT
                                       -------------------------------------
                                           Stephen M. Dow


Dated:  February 13, 1997              /S/ DENNIS J. GORMAN
                                       -------------------------------------
                                           Dennis J. Gorman


Dated:  February 13, 1997              /S/ JOHN V. JAGGERS
                                       -------------------------------------
                                           John V. Jaggers


Dated:  February 13, 1997              /S/ CHARLES H. PHIPPS
                                       -------------------------------------
                                           Charles H. Phipps


                                       SEVIN ROSEN BAYLESS 
                                       MANAGEMENT COMPANY


Dated:  February 13, 1997              By: /S/ JOHN V. JAGGERS, ATTORNEY-IN-FACT
                                          --------------------------------------
                                           Title:  Vice President


                               Page 14 of 18 Pages


<PAGE>



                                  EXHIBIT INDEX

                  EXHIBIT

1.                Joint Filing Agreement.

2.                Power of Attorney.


                               Page 15 of 18 Pages


<PAGE>



                                    EXHIBIT 1

                  THIS DOCUMENT HAS BEEN SIGNED IN COUNTERPART

                             JOINT FILING AGREEMENT


                  In accordance with Rule 13d-1(f) under the Securities Exchange
Act of 1934, the persons named below agree to the joint filing on behalf of each
of them of a Statement  on Schedule  13G  (including  amendments  thereto)  with
respect to the common stock of ViroPharma  Incorporated,  and further agree that
this Joint Filing Agreement be included as an Exhibit to such joint filings.  In
evidence thereof each of the undersigned,  being duly authorized, hereby execute
this Agreement on the date set forth opposite its or his name.

                                   SEVIN ROSEN FUND IV L.P.

                                   By: SRB ASSOCIATES IV L.P.,
                                         General Partner



Dated:  February 13, 1997             By:/S/ JOHN V. JAGGERS
                                         ----------------------------------
                                         John V. Jaggers, a General Partner


                                    SRB ASSOCIATES IV L.P.



Dated:  February 13, 1997           By:/S/ JOHN V. JAGGERS
                                       -----------------------------------
                                       John V. Jaggers, a General Partner



Dated:  February 13, 1997              /S/ JON W. BAYLESS
                                       -----------------------------------
                                       Jon W. Bayless



Dated:  February 13, 1997              /S/ JOHN V. JAGGERS, ATTORNEY-IN-FACT
                                       -----------------------------------
                                       Stephen M. Dow





                               Page 16 of 18 Pages


<PAGE>



Dated:  February 13, 1997              /S/ DENNIS J. GORMAN
                                       -----------------------------------
                                       Dennis J. Gorman



Dated:  February 13, 1997              /S/ JOHN V. JAGGERS
                                       -----------------------------------
                                       John V. Jaggers



Dated:  February 13, 1997              /S/ CHARLES H. PHIPPS
                                       -----------------------------------
                                       Charles H. Phipps



                                       SEVIN ROSEN BAYLESS 
                                       MANAGEMENT COMPANY



Dated:  February 13, 1997              By:  /S/ JOHN V. JAGERS, ATTORNEY-IN-FACT
                                          --------------------------------------
                                                     Title:




                               Page 17 of 18 Pages


<PAGE>


                                    EXHIBIT 2

                                POWER OF ATTORNEY

                  The undersigned, STEPHEN M. DOW, hereby makes, constitutes and
appoints each of DENNIS J. GORMAN, JOHN V. JAGGERS AND JON W. BAYLESS,  and each
of them singly, his true and lawful  attorney-in-fact and agent, with full power
to them, and each of them singly,  and with full power of substitution,  to sign
for the  undersigned  and in his  name,  any Form  144,  Form 3, Form 4, Form 5,
Schedule 13D and Schedule 13G, and any and all amendments  thereto,  and to file
the same, and all exhibits thereto,  and all documents in connection  therewith,
with the Securities and Exchange  Commission,  and generally to do all things in
the name of the  undersigned  and on his  behalf to enable  the  undersigned  to
comply  with the  reporting  requirements  of the  Securities  Act of  1933,  as
amended,  and  the  Securities  Exchange  Act  of  1934,  as  amended,  and  all
requirements of the Securities and Exchange Commission.

                  This Power of Attorney shall not be affected by the subsequent
disability or incompetence of the undersigned.

                  This Power of Attorney may not be changed orally.

                  The undersigned hereby agrees that any third party receiving a
duly executed copy or  reproduction  of this Power of Attorney may act under it.
Revocation or termination of this Power of Attorney will not be effective  until
the third party receives actual knowledge of the termination or revocation.  The
undersigned shall hold harmless any third party from and against any claims that
may arise  against  the third  party as a result of  reliance  on this  Power of
Attorney.

                  IN WITNESS WHEREOF, the undersigned has executed this Power of
Attorney as of the 13th day of June, 1994.


                                                    /s/  Stephen M. Dow
                                                    ---------------------------
                                                         Stephen M. Dow

STATE OF TEXAS                      )
                                    )ss.:
COUNTY OF DALLAS                    )

                  On this  13th day of June,  1994  before  me  personally  came
Stephen M. Dow, to me known and known to me to be the  individual  described in,
and who executed the foregoing  instrument,  and he  acknowledged  to me that he
executed the same.


                                                    /s/ Jo Anne Eisler
                                                    ---------------------------
                                                        Notary Public
My commission expires:  May 27, 1998


                               Page 18 of 18 Pages








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