BELLET DAVID F
SC 13G/A, 1997-07-31
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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)*

                               MapInfo Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.02 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    565105103
            --------------------------------------------------------
                                 (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
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).

                         Index to Exhibits is on Page 17


                                  Page 1 of 18
<PAGE>

 CUSIP No.      565105103              13G                 Page     2   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Glynn Capital Management
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group*                  a.  |_|
                                                                         b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      California
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     3   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Crown-Glynn Advisors, Ltd.
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group*                  a.  |_|
                                                                         b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      New York
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     4   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Crown Advisors, Ltd.
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group*                  a.  |_|
                                                                         b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      New York
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     5   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Crown Capital Management, Ltd.
- --------------------------------------------------------------------------------
2     Check the Appropriate Box If a Member of a Group*                  a.  |_|
                                                                         b.  |_|
- --------------------------------------------------------------------------------
3     SEC Use Only

- --------------------------------------------------------------------------------
4     Citizenship or Place of Organization

      New York
- --------------------------------------------------------------------------------
                  5     Sole Voting Power
  Number of       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IA
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     6   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Darryl Messinger
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     7   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Steven Rosston
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     8   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      David F. Bellet
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     9   of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Chester A. Siuda
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     10  of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Margaret S. McNamara
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     11  of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      Jeffrey S. Hamren
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

 CUSIP No.      565105103              13G                 Page     12  of   18 
- --------------------------------------------------------------------------------
1     Name of Reporting Person
      S.S. or I.R.S. Identification No. of Above Person

      John Walter Glynn, Jr.
- --------------------------------------------------------------------------------
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       
   Shares               0
Beneficially            --------------------------------------------------------
  Owned By        6     Shared Voting Power     
    Each                                        
  Reporting             0
   Person               --------------------------------------------------------
    With          7     Sole Dispositive Power  
                                                         
                        0
                        --------------------------------------------------------
                  8     Shared Dispositive Power
                                                
                        0
- --------------------------------------------------------------------------------
9     Aggregate Amount Beneficially Owned by Each Reporting Person

      0
- --------------------------------------------------------------------------------
10    Check Box If the Aggregate Amount in Row (9) Excludes Certain Shares* |_|


- --------------------------------------------------------------------------------
11    Percent of Class Represented By Amount in Row (9)

      0%
- --------------------------------------------------------------------------------
12    Type of Reporting Person*

      IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

Item 1(a)         Name of Issuer: MapInfo Corporation

Item 1(b)         Address of Issuer's Principal Executive Offices:

                  One Global View, Troy, NY 12180

Item 2(a)         Names of Person Filing    See cover pages.

                  (See footnote to 2(a).)

Item 2(b)         Address of  Principal Business Office or, if none Residence:

                  As to the following filing persons:
                  Crown-Glynn Associates, Limited Partnership
                  Crown Associates III, Limited Partnership
                  Crown Partners III, L.P.
                  Crown-Glynn Partners, L.P.
                  Crown-Glynn Advisors Ltd.
                  Crown Capital Management Ltd.
                  Crown Advisors Ltd.
                  Chester A. Siuda
                  Margaret S. McNamara
                  Jeffrey S. Hamren

                  67 East Park Place
                  8th Floor
                  Morristown, NJ  07960

                  As to the following filing person:
                  David F. Bellet
                  60 East 42nd Street, Suite 3405
                  New York, NY  10165

                  As to the following filing persons:
                  Glynn Buckley Investments, L.P.
                  McMorgan Fund II, L.P.
                  Glynn Capital Management
                  Glynn Emerging Opportunity Fund
                  Glynn Investment, L.P.,
                  John W. Glynn, Jr.
                  Steven Rosston
                  Daryl Messinger

                  3000 Sand Hill Road
                  Building 4, Suite 235
                  Menlo Park, CA  94025

                  Relationship of filing persons:
                  Glynn Capital Management, Crown-Glynn Advisors, Ltd., Crown
                  Capital Management, Ltd., and Crown Advisors, Ltd., are
                  registered Investment Advisors.


                                 Page 13 of 18
<PAGE>

                  Glynn Capital Management is investment advisor to Glynn
                  Emerging Opportunity Fund, a California limited partnership,
                  Glynn Buckley Investments, a California limited partnership,
                  McMorgan Fund II, a California limited partnership, and Glynn
                  Investments, a California limited partnership.

                  Crown-Glynn Advisors, Ltd. is investment advisor to Crown
                  Associates III, a Delaware limited partnership, and
                  Crown-Glynn Associates, a Delaware limited partnership.

                  Crown Capital Management, Ltd. is investment advisor to The
                  Crown Trust, a New York Trust.

                  Crown Advisors, Ltd., is a sub-advisor to Crown-Glynn Advisors
                  and Crown Capital Management.

                  John W. Glynn, Jr., David F. Bellet and Chester A. Siuda are
                  Managing Directors of Crown Capital Management and Crown-Glynn
                  Advisors. John W. Glynn, Jr., is sole owner of Glynn Capital
                  Management. David F. Bellet and Chester A. Siuda are the
                  owners of Crown Advisors, Ltd.

                  John W. Glynn, Jr., David F. Bellet, Chester A. Siuda, Jeffrey
                  S. Hamren, Daryl Messinger, Steven Rosston, and Margaret S.
                  McNamara are General Partners of Crown Partners III, L.P., a
                  Delaware limited partnership and Crown-Glynn Partners, L.P., a
                  Delaware partnership. General Partners of Crown Associates
                  III, L.P., and Crown-Glynn Associates, L.P., respectively.

Item 2(c)         Citizenship: See cover pages

Item 2(d)         Title of Class of Securities: Common Stock, $.02 par value

Item 2(e)         CUSIP Number: 565105103

Item 3.           If this statement is filed pursuant to Rules 13d-1(b), or
                  13d-2(b), check whether the person filing 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,

                  (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;

- --------------------------------------------------------------------------------
*     As to Crown-Glynn Advisors, Ltd., Crown Capital Management Ltd. and Glynn
      Capital Management and Crown Advisors, Ltd.


                                 Page 14 of 18
<PAGE>

                        see 13d-1(b)(1)(ii)(F),

                  (g)   Parent Holding Company, in accordance with Section
                        240.13d-1(b)(ii)(G),

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

Item 4.           Ownership: See cover pages.

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 [X].

Item 6.           Ownership of More Than Five Percent on Behalf of Another
                  Person: Not applicable.

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:

                           By signing below I certify that, to the best of my
                  knowledge and belief, the securities referred to above were
                  acquired in the ordinary course of business and were not
                  acquired for the purpose of and do not have the effect of
                  changing or influencing the control of the issuer of such
                  securities and were not acquired in connection with or as a
                  participant in any transaction having such purposes or effect.


                                 Page 15 of 18
<PAGE>

                               13-G SIGNATURE PAGE

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 14, 1997


CROWN-GLYNN ASSOCIATES, LIMITED             /s/ John W. Glynn, Jr.
PARTNERSHIP                                 ------------------------------------
By  Crown-Glynn Partners, L.P. as               John W. Glynn, Jr.*
         General Partner

                                            /s/ Steven Rosston
                                            ------------------------------------
                                                Steven Rosston


CROWN ASSOCIATES III, LIMITED               /s/ Daryl Messinger
     PARTNERSHIP                            ------------------------------------
By Crown-Glynn Partners III, L.P.  as           Daryl Messinger
         General Partner


CROWN PARTNERS III, L.P.                    /s/ David F. Bellet
                                            ------------------------------------
                                                David F. Bellet


CROWN-GLYNN PARTNERS, L.P.                  /s/ Chester A. Siuda
                                            ------------------------------------
                                                Chester A. Siuda


By /s/ David F. Bellet                      /s/ Jeffrey S. Hamren              
   --------------------------------         ------------------------------------
       General Partner                          Jeffrey S. Hamren


                                            /s/ Margaret S. McNamara          
                                            ------------------------------------
                                                Margaret S. McNamara


CROWN CAPITAL MANAGEMENT LTD.


CROWN ADVISORS, LTD.


CROWN-GLYNN ADVISORS, LTD.


By /s/ David F. Bellet                
   --------------------------------

- --------------------------------------------------------------------------------
*     Individually and on behalf of Glynn Capital Management, Glynn Emerging
      Opportunity Fund, Glynn Investment L.P., GCM Pension, Glynn Buckley
      Investments, L.P., McMorgan Fund, L.P.


                                 Page 16 of 18
<PAGE>

                                Index to Exhibits

Joint Filing Agreement.................................................. Page 18


                                 Page 17 of 18


                             JOINT FILING AGREEMENT

      Each of the undersigned hereby agrees that the Schedule 13G filed on the
date hereof has been filed on behalf of each of the undersigned.

Dated: February 14, 1997


CROWN-GLYNN ASSOCIATES, LIMITED             /s/ John W. Glynn, Jr.
PARTNERSHIP                                 ------------------------------------
By  Crown-Glynn Partners, L.P. as               John W. Glynn, Jr.*
         General Partner

                                            /s/ Steven Rosston
                                            ------------------------------------
                                                Steven Rosston


CROWN ASSOCIATES II, LIMITED                /s/ Daryl Messinger
     PARTNERSHIP                            ------------------------------------
By Crown-Glynn Partners III, L.P.  as           Daryl Messinger
         General Partner


CROWN PARTNERS III, L.P.                    /s/ David F. Bellet
                                            ------------------------------------
                                                David F. Bellet


CROWN-GLYNN PARTNERS, L.P.                  /s/ Chester A. Siuda
                                            ----------------------------------
                                                Chester A. Siuda


By /s/ David F. Bellet                      /s/ Jeffrey S. Hamren              
   --------------------------------         ----------------------------------
       General Partner                          Jeffrey S. Hamren


                                            /s/ Margaret S. McNamara          
                                            ----------------------------------
                                                Margaret S. McNamara


CROWN CAPITAL MANAGEMENT LTD.


CROWN ADVISORS, LTD.


CROWN-GLYNN ADVISORS, LTD.


By /s/ David F. Bellet                
   --------------------------------

- --------------------------------------------------------------------------------
*     Individually and on behalf of Glynn Capital Management, Glynn Emerging
      Opportunity Fund, Glynn Investment L.P., GCM Pension, Glynn Buckley
      Investments, L.P., McMorgan Fund, L.P.


                                 Page 18 of 18



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