LEGATO SYSTEMS INC
SC 13D, 1998-11-04
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549



                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934



                               QUALIX GROUP, INC.
- --------------------------------------------------------------------------------
                                (Name of Issuer)



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



                                    747586105
- --------------------------------------------------------------------------------

                                 (CUSIP Number)

                                 STEPHEN C. WISE
                Senior Vice President, Finance and Administration
                           and Chief Financial Officer
                                3210 PORTER DRIVE
                               PALO ALTO, CA 94304
                                 (650) 812-6000
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                October 25, 1998
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), (f) or (g), check the following box.

NOTE:  Schedules  filed in paper format shall include a signed original and five
copies of the  Schedule,  including  all  exhibits.  See Rule 13d-1(A) for other
parties to whom copies are to be sent.

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).

<PAGE>
                                  SCHEDULE 13D

- ------------------------------------------------------
CUSIP NO.   747586105
- ------------------------------------------------------

- -------- -----------------------------------------------------------------------
1        NAME OF REPORTING PERSON
         I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (ENTITIES ONLY)

         Legato Systems, Inc.  (IRS ID No. 99-3077394)
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
         (a)      X   Not Applicable
         (b)
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
3        SEC USE ONLY

- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
4        SOURCE OF FUNDS

         00
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT 
         TO ITEMS 2(d) or (e) __
         N/A
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
6        CITIZENSHIP OR PLACE OF ORGANIZATION

         State of Delaware
- -------- -----------------------------------------------------------------------
- ------------------------------ ----- -------------------------------------------
          NUMBER OF            7     SOLE VOTING POWER
           SHARES                    N/A
        BENEFICIALLY
          OWNED BY
          REPORTING
         PERSON WITH
                               ----- -------------------------------------------
                               ----- -------------------------------------------
                               8     SHARED VOTING POWER
                                     1,399,471
                               ----- -------------------------------------------
                               ----- -------------------------------------------
                               9     SOLE DISPOSITIVE POWER
                                     N/A
                               ----- -------------------------------------------
                               ----- -------------------------------------------
                               10    SHARED DISPOSITIVE POWER
                                     N/A
- ------------------------------ ----- -------------------------------------------
- -------- -----------------------------------------------------------------------
11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
         1,399,471
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES* __
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
         13.1%
- -------- -----------------------------------------------------------------------
- -------- -----------------------------------------------------------------------
14       TYPE OF REPORTING PERSON
         CO
- -------- -----------------------------------------------------------------------
                      *SEE INSTRUCTIONS BEFORE FILLING OUT!
          INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7


<PAGE>
                                  SCHEDULE 13D



                  Neither  the  filing  of  this  Schedule  13D  nor  any of its
contents shall be deemed to constitute an admission by Legato Systems, Inc. that
it is the  beneficial  owner of any of the Common  Stock  referred to herein for
purposes of Section  13(d) of the  Securities  Exchange Act of 1934,  as amended
(the  "Act"),  or for any  other  purpose,  and  such  beneficial  ownership  is
expressly disclaimed.


Item 1    Security and Issuer.

                  This  statement on Schedule 13D relates to the Common Stock of
Qualix Group, Inc., a Delaware corporation ("Qualix" or "Issuer"). The principal
executive  offices of Qualix are located at 177 Bovet Road,  Second  Floor,  San
Mateo, California 94402.


Item 2    Identity and Background.

                  The name of the  corporation  filing this  statement is Legato
Systems, Inc., a Delaware corporation ("Legato"). Legato's principal business is
as a provider of enterprise storage management software products. The address of
the  principal  executive  offices of Legato is 3210  Porter  Drive,  Palo Alto,
California  94304.  Set  forth  in  SCHEDULE  A is a list of  each  of  Legato's
directors and executive  officers as of the date hereof,  along with the present
principal  occupation or employment  of such  directors and executive  officers,
their respective citizenship and the name, principal business and address of any
corporation or other  organization other than Legato in which such employment is
conducted.

                  During the past five years  neither  Legato  nor,  to Legato's
knowledge,  any person named in SCHEDULE A to this statement, has been convicted
in a criminal proceeding (excluding traffic violations or similar misdemeanors).
Also during the past five years neither Legato nor, to Legato's  knowledge,  any
person named in SCHEDULE A to this statement,  was a party to a civil proceeding
of a judicial or  administrative  body of competent  jurisdiction as a result of
which  such  person  was or is  subject  to a  judgment,  decree or final  order
enjoining future violations of, or prohibiting or mandating activity subject to,
federal or state  securities  laws or finding any violation with respect to such
laws.  Consequently,  neither Legato nor, to Legato's best knowledge, any person
named on SCHEDULE A hereto is required to disclose legal proceedings pursuant to
Item 2(d) or 2(e) of Schedule 13D.


Item 3    Source and Amount of Funds or Other Consideration.

     Pursuant to an Agreement  and Plan of  Reorganization,  dated as of October
25, 1998,  (the "Merger  Agreement"),  among Legato,  HAT  Acquisition  Corp., a
Delaware corporation and a wholly-owned subsidiary of Legato ("Merger Sub"), and
Qualix, and subject to the conditions set forth therein  (including  approval by
the  stockholders  of  Qualix),  Merger Sub will merge with and into  Qualix and
Qualix will become a wholly-owned subsidiary of Legato (such events constituting
the "Merger").  Upon consummation of the Merger,  Merger Sub will cease to exist
as a corporation and all of the business, assets, liabilities and obligations of
Merger Sub will be merged into Qualix with  Qualix  remaining  as the  surviving
corporation  (the  "Surviving  Corporation").  As a result of the  Merger,  each
holder of an outstanding share of Qualix Common Stock will receive a fraction of
a share of Legato Common Stock equal to the Exchange Ratio. The "Exchange Ratio"
equals a number, the numerator of which is (i) 1,721,000 shares of Legato Common
Stock and the denominator of which is equal to (ii) the sum of (A) the aggregate
number of shares of Qualix Common Stock  outstanding  at the Effective  Time (as
such  term  is  defined  in the  Merger  Agreement)  of the  Merger  and (B) the
aggregate  number of shares of Qualix Common Stock issuable upon exercise of all
outstanding  options to acquire Qualix Common Stock at the Effective Time of the
Merger. The Company will also assume all outstanding Qualix stock options in the
transaction. The foregoing summary of the Merger is qualified in its entirety by
reference to the copy of the Merger  Agreement  included as EXHIBIT 99.1 to this
Schedule 13D and incorporated herein by reference.

     This  statement on Schedule 13D also relates to certain  Voting  Agreements
described  in Item 4 below and the Stock  Option  Agreement  described in Item 6
below.


Item 4    Purpose of Transaction.

                  (A) - (B) As described in Item 3 above, this statement relates
to the Merger of Merger Sub, a wholly-owned  subsidiary of Legato, with and into
Qualix in a statutory  merger pursuant to the provisions of the Delaware General
Corporation Law. At the Effective Time of the Merger,  the separate existence of
Merger Sub will cease and the existence of Qualix will continue as the Surviving
Corporation  and as a  wholly-owned  subsidiary  of  Legato.  Each  holder of an
outstanding  share of Qualix  Common Stock will receive a fraction of a share of
Legato Common Stock equal to the Exchange Ratio.

                  As an inducement to Legato to enter into the Merger Agreement,
each  stockholder  of Qualix who is a party to a Voting  Agreement,  dated as of
October  25,  1998 (each a "Voting  Agreement,"  and  collectively,  the "Voting
Agreements"),  among the parties thereto (each a "Voting Agreement Stockholder,"
and collectively,  the "Voting  Agreement  Stockholders")  with Legato,  has, by
executing a Voting  Agreement,  irrevocably  appointed Legato, or any nominee of
Legato as his, her or its lawful  attorney  and proxy.  Such proxies give Legato
the limited right to vote the shares of Qualix Common Stock  beneficially  owned
by the Voting  Agreement  Stockholders  (including  any shares of Qualix  Common
Stock that such stockholders acquire after the time they entered into the Voting
Agreements) (collectively, the "Shares").

                  The names of the Voting Agreement Stockholders,  the number of
shares of Qualix Common Stock  beneficially  owned by each such  stockholder and
the percentage  ownership of Qualix Common Stock by each such stockholder is set
forth in SCHEDULE B hereto which is hereby incorporated by this reference.

                  In exercising its right to vote the Shares as lawful  attorney
and proxy of the Voting Agreement Stockholders, Legato will be limited, at every
Qualix  stockholders  meeting and every written consent in lieu of such meeting,
to vote the Shares in favor of approval of the Merger and the Merger  Agreement.
Each of the  Voting  Agreement  Stockholders  may vote his or her  Shares on all
other matters.  The Voting Agreements terminate upon the earlier to occur of (i)
such date and time as the Merger shall become  effective in accordance  with the
terms and  provisions  of the Merger  Agreement  or (ii) such date as the Merger
Agreement  shall be  terminated in  accordance  with its terms (the  "Expiration
Date"). Each Voting Agreement Stockholder may only transfer his or her Shares if
such shares remain subject to the terms of the Voting  Agreement.  The foregoing
summary of the terms of the Voting  Agreement  is  qualified  in its entirety by
reference  to the form of Voting  Agreement  included  as  EXHIBIT  99.2 to this
Schedule 13D and incorporated herein by reference.

     (c) Not applicable.

     (d) It is anticipated that, upon consummation of the Merger,  the directors
and the initial officers of the Merger Sub (each of whom is an executive officer
of  Legato)  immediately  prior to the Merger  shall  generally  be the  current
directors  and  officers  of  Surviving  Corporation,   until  their  respective
successors are duly elected or appointed and qualified.

     (e) See discussion of Merger in Item 3 above.

     (f) Other than as a result of the  Merger  described  in Item 3 above,  not
applicable.

     (g) Upon  consummation of the Merger, the Certificate of  Incorporation  of
Merger  Sub,  as in  effect  immediately  prior  to  the  Merger,  shall  be the
Certificate  of  Incorporation  of the Surviving  Corporation  until  thereafter
amended as provided by Delaware Law and such Certificate of Incorporation.  Upon
consummation of the Merger,  the Bylaws of Merger Sub, as in effect  immediately
prior to the  Merger,  shall be the Bylaws of the  Surviving  Corporation  until
thereafter amended.

     (h) Upon consummation of the Merger,  Qualix Common Stock will be de-listed
from The Nasdaq Stock Market.

     (i)  Upon  consummation  of  the  Merger,   Qualix  Common  Stock  will  be
de-registered  under the  Securities  Act  pursuant  to Section  12(g)(4) of the
Securities Act by filing a Form 15 with the Securities and Exchange  Commission.

     (j) Other than described  above,  Legato currently has no plan or proposals
which relate to, or may result in, any of the matters listed in Items 4(A) - (i)
of Schedule 13D (although Legato reserves the right to develop such plans).

Item 5    Interest in Securities of the Issuer.

                  (A) - (B) As a result  and  subject to the terms of the Voting
Agreements and the irrevocable proxies granted pursuant thereto,  Legato has the
sole power to vote an  aggregate  of  1,399,471  shares of Qualix  Common  Stock
(including an aggregate of 338,768 shares subject to options  purchasable by the
Voting  Agreement  Stockholders  within  60 days of  October  25,  1998) for the
limited purposes described in Item 4 above. Such shares constitute approximately
13.1% of the issued and outstanding  shares of Issuer Common Stock as of October
25, 1998 (after giving effect to the exercise of all options  exercisable within
60 days of such date).  Other than with respect to the  provisions of the Voting
Agreements,  Legato  does not have the  right to vote the  Shares  on any  other
matters.  Legato does not share voting power of any additional  shares of Qualix
Common  Stock with regard to the limited  purposes  set forth in Item 4 above or
otherwise.  Legato does not have the sole power to vote or to direct the vote or
to dispose or direct the  disposition  of any shares of Qualix Common Stock.  To
Legato's  knowledge,  no shares of Issuer Common Stock are beneficially owned by
any of the persons named in SCHEDULE A.

     (c) Legato has not effected any  transaction  in Issuer Common Stock during
the past 60 days  and,  to  Legato's  knowledge,  none of the  persons  named in
SCHEDULE A has effected any  transaction  in Issuer Common Stock during the past
60 days.

     (d) Not applicable.

     (e) Not applicable.

Item 6    Contracts, Arrangements, Understandings or Relationships with Respect
          to Securities of the Issuer.

     Under the terms of a Stock Option Agreement,  dated as of October 25, 1998,
between Legato and Qualix (the "Stock Option Agreement"),  Qualix granted Legato
an option (the "Merger  Option") to acquire a number of shares of Qualix  Common
Stock,  at the  price of $5.73  per  share,  equal to 19.9% of  shares of Qualix
capital  stock  issued  and  outstanding  on  the  date  the  Merger  Option  is
exercisable.  The Merger Option is exercisable (i) upon public  disclosure of an
Acquisition  Proposal for an Alternative  Transaction (as such terms are defined
in the Stock Option Agreement) with respect to Qualix, with any party other than
Legato (or an affiliate of Legato),  (ii) upon the  commencement  of an election
contest  within the meaning of Rule 14a-11 of the  Exchange Act with the purpose
of seeking to effect a Change in Control of the Qualix  Board of  Directors,  or
(iii)  upon  termination  of the Merger  Agreement  pursuant  to Section  7.1(e)
thereof.  Under the terms of the Stock Option Agreement,  any proceeds to Legato
in excess of the sum of (x) $1,500,000 plus (y) the Exercise Price multiplied by
the number of Qualix Shares  purchased by Legato pursuant to the Option shall be
remitted  by  Legato to  Qualix.  The  foregoing  summary  of the  Stock  Option
Agreement  is qualified in its entirety by reference to the form of Stock Option
Agreement included as EXHIBIT 99.3 to this Schedule 13D and incorporated  herein
by reference.

     Other than the Merger Agreement, the Voting Agreements and the Stock Option
Agreement,   to  the  best   knowledge  of  Legato,   there  are  no  contracts,
arrangements,  understandings  or  relationships  (legal or otherwise) among the
persons  named in Item 2 and between such persons and any person with respect to
any securities of Qualix, including but not limited to transfer or voting of any
of the securities,  finder's fees, joint ventures,  loan or option  arrangement,
puts or calls, guarantees of profits, division of profits or loss, or the giving
or withholding of proxies.


Item 7    Materials to be Filed as Exhibits.

                  The following documents are included as exhibits:

     1. Agreement and Plan of  Reorganization,  dated as of October 25, 1998, by
and among Legato Systems, Inc., a Delaware corporation, HAT Acquisition Corp., a
Delaware corporation and a wholly-owned  subsidiary of Legato Systems, Inc., and
Qualix Group, Inc., a Delaware corporation.

     2. Form of Voting Agreement,  dated as of October 25, 1998,  between Legato
Systems, Inc., a Delaware corporation, and certain stockholders of Qualix Group,
Inc., a Delaware corporation.

     3. Form of Stock Option  Agreement,  dated as of October 25, 1998,  between
Legato Systems, Inc., a Delaware corporation, and Qualix Group, Inc., a Delaware
corporation.


<PAGE>


                                    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.

Dated:  November 4, 1998

                        LEGATO SYSTEMS, INC.



                        By:    /s/ Stephen C. Wise
                               Stephen C. Wise
                               Senior Vice President, Finance and Administration
                               and Chief Financial Officer





<PAGE>


                                       S-3
                                       S-1
                                   SCHEDULE A

                       DIRECTORS AND EXECUTIVE OFFICERS OF
                              LEGATO SYSTEMS, INC.

<TABLE>


<CAPTION>
                                               Present Principal Occupation
      Name and Title (1)                           and Name of Employer                   Citizenship
      ------------------                           --------------------                   -----------
<S>                                            <C>                                         <C>       
      Louis C. Cole                                     Legato Systems, Inc.                  U.S.
      Chairman, President and Chief
      Executive Officer

      Kent D. Smith                                     Legato Systems, Inc.                  U.S.
      Executive Vice President
      and Chief Operating Officer

      Stephen C. Wise                                   Legato Systems, Inc.                  U.S.
      Senior Vice President, Finance and
      Administration and Chief Financial
      Officer

      Nora M. Denzel                                    Legato Systems, Inc.                  U.S.
      Senior Vice President and Chief
      Technical Officer

      John Ferraro                                      Legato Systems, Inc.                  U.S.
      Senior Vice President, Worldwide Sales

      James Chappel                                     Legato Systems, Inc.                  U.S.
      Vice President, Business Development

      Eric A. Benhamou                                Chief Executive Officer                 U.S.
      Director                                            3COM Corporation

      Kevin A. Fong                                       General Partner                     U.S.
      Director                                             Mayfield Fund

      David N. Strohm                                     General Partner                     U.S.
      Director                                    Greylock Management Corporation

      Philip E. White                                      Self-employed                      U.S.
      Director                                     High tech industry consultant

<FN>
(1)    The address for each executive officer and/or director is c/o Legato Systems, Inc., 
       3210 Porter Drive, Palo Alto, California 94304.
</FN>
</TABLE>


<PAGE>


                                   SCHEDULE B

                               QUALIX GROUP, INC.
                          VOTING AGREEMENT STOCKHOLDERS


<TABLE>
<CAPTION>
                                        Shares of Qualix
                                      Beneficially Owned by               Percentage of
Voting Agreement Stockholder       Voting Agreement Stockholder       Common Stock Owned (1)
- ----------------------------       ----------------------------       ----------------------
                                                 

<S>                                                  <C>                       <C> 
Richard G. Thau                                      712,000 (2)               6.7%
Chairman, President and Chief Executive
Officer

Bruce C. Felt                                        134,000 (3)               1.3%
Vice President, Finance and Chief
Financial Officer

Dan E. Kingman                                        60,000                   0.6%
Vice President
Human Resources

David R. Malmstedt                                   224,300 (4)               2.1%
Senior Vice President, Field Sales
Operations

George J. Symons                                      62,927 (5)               0.6%
Vice President, Engineering/ Technical
Services

Louis C. Cole                                          5,889 (6)               0.06%
Director

Kenneth A. Goldman                                    22,400                   0.2%
Director

William Hart                                          45,344 (7)               0.4%
Director

William D. Jobe                                       67,751 (8)               0.6%
Director

Peter L. Wolken                                       64,860 (9)               0.6%
Director

<FN>
(1)    Applicable  percentage  ownership is based on 10,668,986 shares of Common
       Stock  outstanding  as of  October  25,  1998.  Beneficial  ownership  is
       determined in accordance  with the rules of the  Commission and generally
       includes voting or investment  power with respect to securities,  subject
       to community  property  laws,  where  applicable.  Shares of Common Stock
       subject to options that are presently  exercisable or exercisable  within
       60 days of October  25, 1998 are deemed to be  beneficially  owned by the
       person  holding such options for the purpose of computing the  percentage
       of  ownership of such person but are not treated as  outstanding  for the
       purpose of computing the percentage of any other person.

(2)    Includes  62,420 shares of Qualix Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(3)    Includes  19,900 shares of Qualix Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(4)    Includes  200,000 shares of Qualix Common Stock issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(5)    Includes  32,927 shares of Qualix Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(6)    Includes  5,889 shares of Qualix  Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(7)    Includes  5,334 shares of Qualix  Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(8)    Includes  6,944 shares of Qualix  Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.

(9)    Includes  5,344 shares of Qualix  Common Stock  issuable upon exercise of
       outstanding  options  which  are  presently  exercisable  or will  become
       exercisable within 60 days of October 25, 1998.
</FN>
</TABLE>



<PAGE>


                                       E-1
                                  EXHIBIT INDEX



Exhibit No.           Description

99.1 Agreement and Plan of Reorganization,  dated as of October 25, 1998, by and
     among Legato Systems, Inc., a Delaware corporation,  HAT Acquisition Corp.,
     a Delaware  corporation  and a wholly-owned  subsidiary of Legato  Systems,
     Inc. ("Merger Sub"), and Qualix Group, Inc., a Delaware corporation.

99.2 Form of Voting  Agreement,  dated as of October 25,  1998,  between  Legato
     Systems,  Inc., a Delaware  corporation,  and the  undersigned  stockholder
     ("Stockholder") of Qualix Group, Inc., a Delaware corporation.

99.3 Form of Stock  Option  Agreement,  dated as of October  25,  1998,  between
     Legato  Systems,  Inc., a Delaware  corporation  and Qualix Group,  Inc., a
     Delaware corporation.
<PAGE>




                                                                    EXHIBIT 99.1

                      AGREEMENT AND PLAN OF REORGANIZATION

                                  BY AND AMONG

                              LEGATO SYSTEMS, INC.,

                              HAT ACQUISITION CORP.

                                       AND

                               QUALIX GROUP, INC.


                                OCTOBER 25, 1998


<PAGE>


                                TABLE OF CONTENTS

<TABLE>
                                                                                  Page

<S>                                                                                 <C>
ARTICLE I  THE MERGER................................................................2
         1.1  The Merger.............................................................2
         1.2  Closing; Effective Time................................................2
         1.3  Effect of the Merger...................................................2
         1.4  Certificate of Incorporation; Bylaws...................................2
         1.5  Directors and Officers.................................................2
         1.6  Effect on Capital Stock................................................3
         1.7  Surrender of Certificates..............................................4
         1.8  No Further Ownership Rights in Target Capital Stock....................5
         1.9  Lost, Stolen or Destroyed Certificates.................................5
         1.10  Tax and Accounting Consequences.......................................6
         1.11  Taking of Necessary Action; Further Action............................6

ARTICLE II  REPRESENTATIONS AND WARRANTIES OF TARGET.................................6
         2.1  Organization, Standing and Power.......................................6
         2.2  Capital Structure......................................................7
         2.3  Authority..............................................................8
         2.4  SEC Documents; Financial Statements....................................9
         2.5  Absence of Certain Changes.............................................9
         2.6  Absence of Undisclosed Liabilities....................................10
         2.7  Litigation............................................................10
         2.8  Restrictions on Business Activities...................................10
         2.9  Governmental Authorization............................................10
         2.10  Title to Property....................................................11
         2.11 Intellectual Property.................................................11
         2.12 Environmental Matters.................................................12
         2.13  Taxes................................................................13
         2.14  Employee Benefit Plans...............................................14
         2.15  Employees and Consultants............................................16
         2.17  Insurance............................................................17
         2.18  Compliance with Laws.................................................17
         2.19  Brokers' and Finders' Fees...........................................17
         2.20  Pooling of Interests.................................................17
         2.21  Voting Agreement; Irrevocable Proxies................................17
         2.22  Vote Required........................................................18
         2.23  No Breach of Material Contracts......................................18
         2.24 Registration Statement; Proxy Statement/Prospectus....................18
         2.25  Complete Copies of Materials.........................................19
         2.26  Amendment of Rights Plan.............................................19
         2.27  Opinion of Financial Advisor.........................................19
         2.28  Board Approval.......................................................19
         2.28  Section 203 of Delaware Law Not Applicable...........................19
         2.29  Representations Complete.............................................19

ARTICLE III  REPRESENTATIONS AND WARRANTIES OF ACQUIROR AND MERGER SUB..............20
         3.1  Organization, Standing and Power......................................20
         3.2  Capital Structure.....................................................20
         3.3  Authority.............................................................21
         3.4  SEC Documents; Financial Statements...................................22
         3.5  Absence of Certain Changes............................................23
         3.6  Litigation............................................................23
         3.7  Compliance with Laws..................................................23
         3.8  Registration Statement................................................23
         3.9  Board Approval........................................................23
         3.10  Representations Complete.............................................23
         3.11  Intellectual Property................................................24
         3.12  Pooling of Interest..................................................24
         3.13  Interim Operations of Merger Sub.....................................24

ARTICLE IV  CONDUCT PRIOR TO THE EFFECTIVE TIME.....................................24
         4.1  Conduct of Business of Target and Acquiror............................24
         4.2  Conduct of Business of Target.........................................24
         4.3  Conduct of Business of Acquiror.......................................27
         4.4  Notices...............................................................27

ARTICLE V  ADDITIONAL AGREEMENTS....................................................28
         5.1  No Solicitation.......................................................28
         5.2  Proxy Statement/Prospectus; Registration Statement....................29
         5.3  Stockholders Meeting..................................................30
         5.4  Access to Information.................................................30
         5.5  Confidentiality.......................................................30
         5.6  Public Disclosure.....................................................30
         5.7  Consents; Cooperation.................................................31
         5.8  Pooling Accounting....................................................31
         5.9  Update Disclosure; Breaches...........................................32
         5.10  Stockholder Agreements...............................................32
         5.11  Indemnification......................................................32
         5.12  Irrevocable Proxies..................................................33
         5.13  Legal Requirements...................................................33
         5.14  Tax-Free Reorganization..............................................33
         5.15  Stock Options........................................................33
         5.16  Listing of Additional Shares.........................................34
         5.17  Additional Agreements; Reasonable Efforts............................34
         5.18  Employee Benefits....................................................35
         5.20  Pooling Letters......................................................35
         5.20  No Rights Plan Amendment.............................................35

ARTICLE VI  CONDITIONS TO THE MERGER................................................36
         6.1  Conditions to Obligations of Each Party to Effect the Merger..........36
         6.2  Additional Conditions to Obligations of Target........................37
         6.3  Additional Conditions to the Obligations of Acquiror..................38

ARTICLE VII  TERMINATION, EXPENSES, AMENDMENT AND WAIVER............................39
         7.1  Termination...........................................................39
         7.2  Effect of Termination.................................................40
         7.3  Expenses and Termination Fees.........................................41
         7.4  Amendment.............................................................41
         7.5  Extension; Waiver.....................................................41

ARTICLE IX  GENERAL PROVISIONS......................................................42
         8.1  Notices...............................................................42
         8.2  Interpretation........................................................43
         8.3  Counterparts..........................................................43
         8.4  Entire Agreement; No Third Party Beneficiaries........................43
         8.5  Severability..........................................................44
         8.6  Remedies Cumulative...................................................44
         8.7  Governing Law.........................................................44
         8.8  Assignment............................................................44
         8.9  Rules of Construction.................................................44
</TABLE>

SCHEDULES

Target Disclosure Letter
Acquiror Disclosure Letter

Schedule 6.3(c)   Consents
Schedule 6.3 (f)  Employees Executing Employment Agreements
Schedule 6.3 (g)  Employees Executing Separation Agreements


EXHIBITS

Exhibit A         Stock Option Agreement
Exhibit B         Certificate of Merger
Exhibit C         Voting and Proxy Agreement
Exhibit D-1       Target Affiliates Agreement
Exhibit D-2       Acquiror Affiliates Agreement
Exhibit E         Employment Agreement
Exhibit F         Separation Agreement

<PAGE>


                                                         

                      AGREEMENT AND PLAN OF REORGANIZATION



     This AGREEMENT AND PLAN OF  REORGANIZATION  (the  "Agreement")  is made and
entered  into as of October 25,  1998,  by and among  Legato  Systems,  Inc.,  a
Delaware corporation ("Acquiror"), Hat Acquisition Corp., a Delaware corporation
("Merger Sub") and Qualix Group, Inc., a Delaware corporation ("Target").

                                    RECITALS

     A. The Boards of Directors of Target, Acquiror and Merger Sub believe it is
in the best  interests of their  respective  companies and the  stockholders  of
their  respective  companies  that Target and Merger Sub  combine  into a single
company  through  the  statutory  merger of Merger Sub with and into Target (the
"Merger") and, in furtherance thereof, have approved the Merger.

     B. Pursuant to the Merger,  among other things,  each outstanding  share of
capital stock of Target ("Target Capital Stock"), shall be converted into shares
of Common Stock of Acquiror,  $.0001 par value ("Acquiror Common Stock"), at the
rate set forth herein.

     C. Target,  Acquiror and Merger Sub desire to make certain  representations
and warranties and other agreements in connection with the Merger.

     D. The parties  intend,  by executing  this  Agreement,  to adopt a plan of
reorganization within the meaning of Section 368 of the Internal Revenue Code of
1986,  as  amended  (the  "Code"),  and to cause  the  Merger  to  qualify  as a
reorganization under the provisions of Sections 368(a)(1)(A) and 368(a)(2)(E) of
the Code.

     E. The parties  intend for the Merger to be  accounted  for as a pooling of
interests.

     F.  Concurrently with the execution and delivery of this Agreement and as a
condition and inducement to Acquiror to enter into this Agreement,  Acquiror and
Target have entered into a Stock Option  Agreement  dated as of the date of this
Agreement  and  attached  hereto as Exhibit A (the  "Stock  Option  Agreement"),
pursuant to which  Target shall grant  Acquiror an option to purchase  shares of
Common Stock of Target under certain circumstances;

     G.  Concurrent with the execution of this Agreement and as an inducement to
Acquiror to enter into this  Agreement,  certain of the affiliates of Target who
are  stockholders,  officers or directors are entering into an agreement to vote
the shares of Target's  Common Stock owned by such persons to approve the Merger
and against any competing proposals.

     NOW,  THEREFORE,  in consideration of the covenants and representations set
forth herein, and for other good and valuable  consideration,  the parties agree
as follows:


                                    ARTICLE I


                                   THE MERGER

     1.1 The  Merger.  At the  Effective  Time (as  defined in Section  1.2) and
subject to and upon the terms and conditions of this Agreement,  the Certificate
of Merger  attached hereto as Exhibit B (the  "Certificate of Merger"),  and the
applicable  provisions of the Delaware General Corporation Law ("Delaware Law"),
Merger  Sub  shall be  merged  with  and into  Target,  the  separate  corporate
existence of Merger Sub shall cease and Target shall  continue as the  surviving
corporation. Target as the surviving corporation after the Merger is hereinafter
sometimes referred to as the "Surviving Corporation."

     1.2 Closing;  Effective Time. The closing of the transactions  contemplated
hereby  (the  "Closing")  shall  take  place as soon as  practicable  after  the
satisfaction  or waiver of each of the conditions set forth in Article VI hereof
or at such other time as the parties hereto agree (the date on which the Closing
shall occur, the "Closing Date"). The Closing shall take place at the offices of
Gunderson Dettmer Stough Villeneuve Franklin & Hachigian,  LLP, 155 Constitution
Drive,  Menlo Park,  California  94025, or at such other location as the parties
hereto agree.  On the Closing Date, the parties hereto shall cause the Merger to
be consummated by filing the  Certificate of Merger,  together with the required
officers' certificates, with the Secretary of State of the State of Delaware, in
accordance  with the relevant  provisions  of Delaware Law (the time and date of
such filing being the "Effective Time" and the "Effective Date," respectively).

     1.3 Effect of the Merger.  At the Effective  Time, the effect of the Merger
shall be as  provided  in this  Agreement,  the  Certificate  of Merger  and the
applicable  provisions of Delaware Law.  Without  limiting the generality of the
foregoing, and subject thereto, at the Effective Time, all the property, rights,
privileges,  powers  and  franchises  of Target and Merger Sub shall vest in the
Surviving  Corporation,  and all  debts,  liabilities  and  duties of Target and
Merger  Sub shall  become  the debts,  liabilities  and duties of the  Surviving
Corporation.

     1.4 Certificate of Incorporation; Bylaws.

     (a) At the Effective Time, the Certificate of  Incorporation of Merger Sub,
as in effect  immediately  prior to the Effective Time, shall be the Certificate
of  Incorporation  of the  Surviving  Corporation  until  thereafter  amended as
provided  by  Delaware  Law and such  Certificate  of  Incorporation;  provided,
however,  that Article I of the Certificate of Incorporation shall be amended to
read as follows: "The name of the corporation is FullTime Software, Inc.

     (b) The  Bylaws  of  Merger  Sub,  as in  effect  immediately  prior to the
Effective  Time,  shall  be  the  Bylaws  of  the  Surviving  Corporation  until
thereafter  amended.  1.5  Directors and Officers.  At the Effective  Time,  the
directors of Merger Sub  immediately  prior to the  Effective  Time shall be the
directors of the Surviving  Corporation,  to hold office until such time as such
directors resign, are removed or their respective successors are duly elected or
appointed and  qualified.  The officers of Merger Sub  immediately  prior to the
Effective  Time shall be the  officers  of the  Surviving  Corporation,  to hold
office until such time as such officers resign,  are removed or their respective
successors are duly elected or appointed and qualified.

     1.6 Effect on Capital Stock. By virtue of the Merger and without any action
on the part of  Acquiror,  Merger Sub,  Target or the holders of any of Target's
securities:

     (a) Conversion of Target Capital Stock.  At the Effective  Time, each share
of Target  Common  Stock  (including,  with respect to each such share of Target
Common Stock, the associated Rights (as defined in that certain Rights Agreement
(the  "Target  Rights  Plan"),  dated as of July 31,  1997,  between  Target and
Chasemellon   Shareholder  Services,   L.L.C.,  as  Rights  Agent))  issued  and
outstanding  immediately  prior to the Effective  Time (other than any shares of
Target Common Stock to be canceled  pursuant to Section 1.6(b)) will be canceled
and  extinguished  and be  converted  automatically  into the right to receive a
fraction  of a share of  Acquiror  Common  Stock  (the  "Exchange  Ratio"),  the
numerator  of which  is  equal to (i)  1,721,000  shares  (the  "Total  Acquiror
Shares"),  and the  denominator  of  which  is  equal to (ii) the sum of (A) the
aggregate  number of shares of Target Common Stock issued and  outstanding as of
the  Effective  Time,  and (B) the  aggregate  number of shares of Target Common
Stock issuable upon exercise of all outstanding  options (the "Target  Options")
outstanding as of the Effective Time and assumed by Acquiror pursuant to Section
5.15  hereof.  No  adjustment  shall be made in the number of shares of Acquiror
Common Stock issued in the Merger as a result of (a) any increase or decrease in
the market price of Acquiror Common Stock prior to the Effective Time or (b) any
cash  proceeds  received  by Target  from the date  hereof to the  Closing  Date
pursuant to the exercise of currently outstanding Target Options.

     (b)  Cancellation  of Target Capital Stock Owned by Acquiror or Target.  At
the Effective  Time, all shares of Target Capital Stock that are owned by Target
as treasury  stock,  and each share of Target Capital Stock owned by Acquiror or
any  direct  or  indirect  wholly  owned  subsidiary  of  Acquiror  or of Target
immediately  prior to the  Effective  Time shall be  canceled  and  extinguished
without any conversion thereof.  

     (c) Target Stock Option Plans. At the Effective Time, the Target 1991 Stock
Plan,  Target  1995  Stock  Option  Plan  and  Target  1997  Stock  Option  Plan
(collectively,  the  "Target  Stock  Option  Plans") and all options to purchase
Target Common Stock then  outstanding  under the Target Stock Option Plans shall
be assumed by Acquiror  and all  repurchase  rights of the Target  Company  with
respect to such  options  shall be assigned to the Acquiror in  accordance  with
Section 5.15.

     (d) (Intentionally Omitted)

     (e) (Intentionally Omitted)

     (f)  Capital  Stock of Merger  Sub. At the  Effective  Time,  each share of
Common  Stock,  $.0001 par value,  of Merger Sub  ("Merger  Sub Common  Stock"),
issued  and  outstanding  immediately  prior  to the  Effective  Time  shall  be
converted   into  and  exchanged  for  one  validly   issued,   fully  paid  and
nonassessable  share  of  Common  Stock,  $.001  par  value,  of  the  Surviving
Corporation.  Each stock  certificate of Merger Sub evidencing  ownership of any
such shares shall continue to evidence ownership of such shares of capital stock
of the Surviving Corporation.

     (g) Adjustments to Exchange Ratio.  The Exchange Ratio shall be adjusted to
reflect  fully the effect of any stock  split,  reverse  split,  stock  dividend
(including any dividend or distribution of securities  convertible into Acquiror
Common Stock or Target Capital Stock), reorganization, recapitalization or other
like  change with  respect to  Acquiror  Common  Stock or Target  Capital  Stock
occurring after the date hereof and prior to the Effective Time.

     (h) Fractional Shares. No fraction of a share of Acquiror Common Stock will
be issued, but in lieu thereof each holder of shares of Target Capital Stock who
would  otherwise  be entitled to a fraction of a share of Acquiror  Common Stock
(after aggregating all fractional shares of Acquiror Common Stock to be received
by such holder)  shall  receive from  Acquiror an amount of cash (rounded to the
nearest  whole cent) equal to the product of (i) such  fraction,  multiplied  by
(ii) the average  closing price of a share of Acquiror  Common Stock for the ten
most recent days that Acquiror Common Stock has traded ending on the trading day
immediately  prior to the  Effective  Time,  as reported on the Nasdaq  National
Market. 1.7 Surrender of Certificates.

     (a)  Exchange  Agent.  Harris  Trust and Savings Bank shall act as exchange
agent (the "Exchange Agent") in the Merger.

     (b) Acquiror to Provide Common Stock and Cash. Promptly after the Effective
Time,  Acquiror  shall make  available  to the  Exchange  Agent for  exchange in
accordance with this Article I, through such  reasonable  procedures as Acquiror
may adopt, (i) the shares of Acquiror Common Stock issuable  pursuant to Section
1.6(a) in exchange for shares of Target  Capital Stock  outstanding  immediately
prior to the Effective Time, plus cash in an amount sufficient to permit payment
of cash in lieu of fractional shares pursuant to Section 1.6(g).

     (c) Exchange  Procedures.  Promptly after the Effective Time, the Surviving
Corporation  shall cause to be mailed to each holder of record of a  certificate
or certificates  (the  "Certificates")  that immediately  prior to the Effective
Time represented  outstanding  shares of Target Capital Stock, whose shares were
converted into the right to receive shares of Acquiror Common Stock (and cash in
lieu of fractional  shares) pursuant to Section 1.6, (i) a letter of transmittal
(which shall specify that delivery shall be effected, and risk of loss and title
to the  Certificates  shall pass,  only upon receipt of the  Certificates by the
Exchange  Agent,  and shall be in such form and have such  other  provisions  as
Acquiror may reasonably  specify) and (ii) instructions for use in effecting the
surrender of the Certificates in exchange for certificates  representing  shares
of Acquiror Common Stock (and cash in lieu of fractional shares). Upon surrender
of a Certificate  for  cancellation to the Exchange Agent or to such other agent
or  agents  as may be  appointed  by  Acquiror,  together  with  such  letter of
transmittal,  duly  completed  and  validly  executed  in  accordance  with  the
instructions  thereto,  the  holder of such  Certificate  shall be  entitled  to
receive in  exchange  therefor a  certificate  representing  the number of whole
shares of Acquiror  Common Stock and payment in lieu of  fractional  shares that
such  holder  has  the  right  to  receive  pursuant  to  Section  1.6,  and the
Certificate so surrendered  shall  forthwith be canceled.  Until so surrendered,
each  outstanding  Certificate  that,  prior to the Effective Time,  represented
shares of Target Capital Stock will be deemed from and after the Effective Time,
for all corporate purposes, other than the payment of dividends, to evidence the
ownership of the number of full shares of Acquiror  Common Stock into which such
shares of Target  Capital  Stock shall have been so  converted  and the right to
receive an amount in cash in lieu of the  issuance of any  fractional  shares in
accordance with Section 1.6.

     (d) Distributions with Respect to Unexchanged Shares. No dividends or other
distributions with respect to Acquiror Common Stock with a record date after the
Effective Time shall be paid to the holder of any unsurrendered Certificate with
respect to the shares of Acquiror  Common Stock  represented  thereby  until the
holder of record of such  Certificate  surrenders such  Certificate.  Subject to
applicable law, following surrender of any such Certificate, there shall be paid
to the record holder of the certificates  representing  whole shares of Acquiror
Common Stock issued in exchange therefor,  without interest, at the time of such
surrender, the amount of any such dividends or other distributions with a record
date after the Effective Time that would have been  previously  payable (but for
the  provisions of this Section  1.7(d)) with respect to such shares of Acquiror
Common Stock.


     (e)  Transfers  of  Ownership.  If any  certificate  for shares of Acquiror
Common Stock is to be issued in a name other than that in which the  Certificate
surrendered in exchange  therefor is registered,  it shall be a condition of the
issuance  thereof that the  Certificate so surrendered is properly  endorsed and
otherwise  in proper  form for  transfer  and that the  person  requesting  such
exchange  will have paid to Acquiror or any agent  designated by it any transfer
or other taxes required by reason of the issuance of a certificate for shares of
Acquiror  Common Stock in any name other than that of the  registered  holder of
the Certificate  surrendered,  or established to the satisfaction of Acquiror or
any agent designated by it that such tax has been paid or is not payable.

     (f) No Liability.  Notwithstanding anything to the contrary in this Section
1.7, none of the Exchange Agent,  the Surviving  Corporation or any party hereto
shall be liable to any person for any amount  properly paid to a public official
pursuant to any applicable  abandoned  property,  escheat or similar law. 

     1.8 No Further  Ownership  Rights in Target  Capital  Stock.  All shares of
Acquiror Common Stock issued upon the surrender for exchange of shares of Target
Capital Stock in accordance  with the terms hereof  (including  any cash paid in
lieu of  fractional  shares)  shall  be  deemed  to  have  been  issued  in full
satisfaction  of all rights  pertaining to such shares of Target  Capital Stock,
and there shall be no further  registration  of  transfers on the records of the
Surviving  Corporation of shares of Target  Capital Stock that were  outstanding
immediately  prior  to  the  Effective  Time.  If,  after  the  Effective  Time,
Certificates  are presented to the Surviving  Corporation  for any reason,  they
shall be canceled and exchanged as provided in this Article I.

     1.9 Lost, Stolen or Destroyed  Certificates.  In the event any Certificates
shall have been lost,  stolen or  destroyed,  the Exchange  Agent shall issue in
exchange for such lost, stolen or destroyed Certificates,  upon the making of an
affidavit  of that fact by the holder  thereof,  such shares of Acquiror  Common
Stock (and cash in lieu of  fractional  shares) as may be  required  pursuant to
Section 1.6;  provided,  however,  that Acquiror may, in its discretion and as a
condition  precedent  to the issuance  thereof,  require the owner of such lost,
stolen  or  destroyed  Certificates  to  deliver  a bond in  such  sum as it may
reasonably  direct  as  indemnity  against  any claim  that may be made  against
Acquiror,  the Surviving  Corporation  or the Exchange Agent with respect to the
Certificates alleged to have been lost, stolen or destroyed.

     1.10 Tax and Accounting Consequences.  It is intended by the parties hereto
that the Merger  shall (i)  constitute  a  reorganization  within the meaning of
Section 368 of the Code and (ii) qualify for  accounting  treatment as a pooling
of  interests.  No party  shall  take any action  that  would,  to such  party's
knowledge,  cause the Merger to fail to qualify as a  reorganization  within the
meaning of Section 368 of the Code or to qualify for  accounting  treatment as a
pooling of interests.

     1.11 Taking of Necessary Action;  Further Action. If, at any time after the
Effective  Time,  any further  action is necessary or desirable to carry out the
purposes  of this  Agreement  and to vest the  Surviving  Corporation  with full
right, title and possession to all assets, property, rights, privileges,  powers
and  franchises  of Target and Merger Sub, the officers and  directors of Target
and Merger Sub are fully authorized in the name of their respective corporations
or otherwise to take, and shall take, all such lawful and necessary  action,  so
long as such action is not inconsistent with this Agreement.


                                   ARTICLE II


                    REPRESENTATIONS AND WARRANTIES OF TARGET

     Target  represents  and  warrants  to  Acquiror  and  Merger  Sub  that the
statements  contained  in this  Article II are true and  correct,  except as set
forth (i) in the disclosure  letter delivered by Target to Acquiror prior to the
execution and delivery of this  Agreement  (the "Target  Disclosure  Letter") or
(ii) in Target's  most  recently  filed Annual Report on Form 10-K (which report
was filed with the Securities and Exchange  Commission  (the "SEC") on September
28,  1998) and any  Target SEC  Documents  (as  defined  in  Section  2.4) filed
subsequent to September 28, 1998. The Target Disclosure Letter shall be arranged
in paragraphs corresponding to the numbered and lettered paragraphs contained in
this Article II, and the  disclosure  in any  paragraph  shall  qualify only the
corresponding  paragraph in this Article II. Any reference in this Article II to
an agreement being  "enforceable"  shall be deemed to be qualified to the extent
such  enforceability is subject to (i) laws of general  application  relating to
bankruptcy,  insolvency,  moratorium  and the  relief of  debtors,  and (ii) the
availability  of specific  performance,  injunctive  relief and other  equitable
remedies.  In the  remainder  of this  Article  II,  "Target"  will be deemed to
include  (and  each  representation  and  warranty  will  apply  separately  and
collectively  to) Target and each of Target's  subsidiaries,  unless the context
otherwise requires.

     2.1  Organization,  Standing  and  Power.  Target  is  a  corporation  duly
organized,  validly  existing  and  in  good  standing  under  the  laws  of its
jurisdiction  of  organization.  Target  has  the  corporate  power  to own  its
properties  and to carry on its  business  as now  being  conducted  and is duly
qualified to do business and is in good standing in each  jurisdiction  in which
the  failure  to be so  qualified  and in good  standing  would  have a Material
Adverse  Effect (as defined in Section 8.2) on Target.  Target has  delivered to
Acquiror a true and correct copy of the Certificate of Incorporation  and Bylaws
or other charter documents,  as applicable,  of Target, each as amended to date.
Target  is not in  violation  of any of the  provisions  of its  Certificate  of
Incorporation or Bylaws or equivalent  organizational  documents.  Target is the
owner of all outstanding shares of capital stock of each of its subsidiaries and
all  such  shares  are  duly   authorized,   validly  issued,   fully  paid  and
nonassessable.  All of the  outstanding  shares  of  capital  stock of each such
subsidiary are owned by Target free and clear of any liens,  charges,  claims or
encumbrances  or  rights of  others.  There  are no  outstanding  subscriptions,
options,  warrants, puts, calls, rights,  exchangeable or convertible securities
or other  commitments  or agreements of any character  relating to the issued or
unissued capital stock or other securities of any such subsidiary,  or otherwise
obligating  Target or any such subsidiary to issue,  transfer,  sell,  purchase,
redeem or  otherwise  acquire any such  securities.  Target does not directly or
indirectly own any equity or similar interest in, or any interest convertible or
exchangeable  or  exercisable  for,  any  equity or  similar  interest  in,  any
corporation, partnership, joint venture or other business association or entity.

     2.2 Capital  Structure.  The authorized capital stock of Target consists of
20,000,000  shares of Common Stock,  $0.001 par value,  and 5,000,000  shares of
Preferred Stock, $0.001 par value, of which there were issued and outstanding as
of  October  22,  1998,  10,675,536  shares  of  Common  Stock  and no shares of
Preferred Stock. No change in the Target's  capitalization  has occurred between
October 22, 1998 and the date hereof except (x) the issuance of shares of Target
Common  Stock  pursuant  to the  exercise  of  outstanding  options  or (y)  the
cancellation of unvested  options for Common Stock held by, or the repurchase of
unvested shares of Common Stock from, directors, employees, consultants or other
service  providers of Target pursuant to the terms of their stock option,  stock
purchase or stock restriction agreements.  There are no other outstanding shares
of capital stock or voting  securities and no  outstanding  commitments to issue
any  shares  of  capital  stock  or  voting  securities  after  the date of this
Agreement,  other than pursuant to the exercise of (i) options outstanding as of
the date of this  Agreement  under the Target Stock Option  Plans,  and (ii) the
exercise of  subscription  rights  outstanding  as of the date of this Agreement
under  the  Target  Employee  Stock  Purchase  Plan  (the  "Target  ESPP").  All
outstanding shares of Target Capital Stock are duly authorized,  validly issued,
fully paid and  non-assessable  and are free of any liens or encumbrances  other
than any liens or encumbrances  created by or imposed upon the holders  thereof,
and are not subject to preemptive  rights,  rights of first  refusal,  rights of
first  offer  or  similar  rights  created  by  statute,   the   Certificate  of
Incorporation or Bylaws of Target or any agreement to which Target is a party or
by which it is bound. As of October 22, 1998,  Target had reserved (i) 2,320,277
shares of Common  Stock for issuance to  employees,  directors  and  consultants
pursuant to the Target Stock Option Plans, of which 1,437,391 shares are subject
to outstanding,  unexercised options and (ii) 350,000 shares of Common Stock for
issuance to employees  pursuant to the Target ESPP, of which 181,831  shares are
available  for  issuance.  Except for (i) the rights  created  pursuant  to this
Agreement,  and (ii) Target's right to repurchase any unvested  shares under the
Target Stock Option Plans, there are no other options,  warrants, calls, rights,
commitments  or  agreements  of any  character  to which Target is a party or by
which it is bound  obligating  Target to issue,  deliver,  sell,  repurchase  or
redeem, or cause to be issued,  delivered,  sold,  repurchased or redeemed,  any
shares of Target capital stock or obligating Target to grant, extend, accelerate
the vesting of,  change the price of, or otherwise  amend or enter into any such
option, warrant, call, right,  commitment or agreement.  There are no contracts,
commitments  or  agreements  relating to the voting,  purchase or sale of Target
Capital Stock (i) between or among Target and any of its  stockholders  and (ii)
to  Target's  knowledge,  among any of Target's  stockholders  or between any of
Target's   stockholders  and  any  third  party,  except  for  the  stockholders
delivering Voting  Agreements (as defined below).  The terms of the Target Stock
Option Plans permit the assumption of such Target Stock Option Plans by Acquiror
or the substitution of options to purchase  Acquiror Common Stock as provided in
this  Agreement,  without  the  consent  or  approval  of  the  holders  of  the
outstanding  options,  the Target  stockholders,  or  otherwise  and without any
acceleration of the exercise  schedule or vesting  provisions in effect for such
options. The current "Purchase Period" (as defined in the Target ESPP) commenced
under the Target ESPP on September  1, 1998 and will end prior to the  Effective
Time, and except for the purchase  rights granted on such  commencement  date to
participants in the current Purchase Period,  there are no other purchase rights
or options  outstanding  under the Target ESPP.  True and complete copies of all
agreements and  instruments  relating to or issued under the Target Stock Option
Plans and Target ESPP have been made available to Acquiror,  and such agreements
and instruments have not been amended,  modified or supplemented,  and there are
no agreements to amend, modify or supplement such agreements or instruments from
the form made available to Acquiror.  All outstanding Common Stock was issued in
compliance with all applicable  federal and state securities laws, except to the
extent  any such  noncompliance  would  not have a  Material  Adverse  Effect on
Target.

2.3      Authority.

     (a) Target has all  requisite  corporate  power and authority to enter into
this   Agreement,   the   Certificate   of  Merger  and  the  Option   Agreement
(collectively,  the "Transaction  Documents") and to consummate the transactions
contemplated  hereby and thereby.  The execution and delivery this Agreement and
the  other  Transaction  Documents  and  the  consummation  of the  transactions
contemplated  hereby and  thereby  have been duly  authorized  by all  necessary
corporate  action  on the  part of  Target,  subject  only to the  approval  and
adoption of this  Agreement  by Target's  stockholders  and the  approval of the
Merger  by  Target's  stockholders  as  contemplated  by  Section  6.1(a).  This
Agreement  and the other  Transaction  Documents  have been  duly  executed  and
delivered by Target and constitute the valid and binding  obligations of Target,
enforceable against Target in accordance with their terms.

     (b) The execution and delivery of this Agreement and the other  Transaction
Documents  by  Target  do  not,  and the  consummation  and  performance  of the
transactions  contemplated hereby and thereby will not, conflict with, or result
in any violation of, or default under (with or without  notice or lapse of time,
or both), or give rise to a right of  termination,  cancellation or acceleration
of any  obligation  or loss of any  benefit  under,  or  require  a  consent  to
assignment  or a  novation  under  (i)  any  provision  of  the  Certificate  of
Incorporation or Bylaws of Target, as amended, or (ii) any contract,  agreement,
permit, concession,  franchise,  license, judgment, order, decree, statute, law,
ordinance,  rule or regulation  applicable to Target or any of its properties or
assets,  except in the case of clause (ii) as would not have a Material  Adverse
Effect on  Target.  

     (c) No  consent,  approval,  order or  authorization  of, or  registration,
declaration  or filing with, any court,  administrative  agency or commission or
other  governmental  authority  or  instrumentality  ("Governmental  Entity") is
required  by or with  respect to Target in  connection  with the  execution  and
delivery  of  this  Agreement  and  the  other  Transaction   Documents  or  the
consummation of the transactions  contemplated hereby or thereby, except for (i)
the filing of the  Certificate of Merger,  together with the required  officers'
certificates, as provided in Section 1.2; (ii) the filing of the Proxy Statement
(as  defined  in  Section  2.24  hereof)  with  the SEC in  accordance  with the
Securities  Exchange Act of 1934, as amended (the "Exchange  Act") and clearance
thereof by the SEC;  (iii) such  consents,  approvals,  orders,  authorizations,
registrations,  declarations  and  filings as may be required  under  applicable
state securities laws and the securities laws of any foreign country;  (iv) such
filings as may be required under the  Hart-Scott-Rodino  Antitrust  Improvements
Act of 1976, as amended  ("HSR");  and (v) such other consents,  authorizations,
filings,  approvals and  registrations  that, if not obtained or made, would not
have a Material  Adverse  Effect on Target and would not prevent,  or materially
alter or delay the  consummation  of the Merger.  

     2.4 SEC  Documents;  Financial  Statements.  Target has made  available  to
Acquiror  a true  and  complete  copy of each  statement,  report,  registration
statement  (with the prospectus in the form filed pursuant to Rule 424(b) of the
Securities Act), definitive proxy statement, and other filing filed with the SEC
by Target since January 1, 1997, and, prior to the Effective  Time,  Target will
have  furnished  Acquiror  with  true  and  complete  copies  of any  additional
documents   filed  with  the  SEC  by  Target  prior  to  the   Effective   Time
(collectively,  the  "Target  SEC  Documents").  In  addition,  Target  has made
available to Acquiror all  exhibits to the Target SEC  Documents  filed prior to
the date hereof,  and will promptly  make  available to Acquiror all exhibits to
any  additional  Target SEC  Documents  filed prior to the Effective  Time.  All
documents required to be filed as exhibits to the Target SEC Documents have been
so filed, and all Material Contracts (as hereafter defined) so filed as exhibits
are in full force and effect,  except those that have expired in accordance with
their  terms,  and  neither  Target  nor any of its  subsidiaries  is in default
thereunder,  except for any such default that  individually  or in the aggregate
would not or could not reasonably be expected to have a Material  Adverse Effect
on Target.  All  contracts  required  to be filed as  exhibits to the Target SEC
Documents or the Acquiror SEC Documents (as hereafter  defined),  as applicable,
pursuant to Item 601 of Regulation S-K are hereinafter  defined as the "Material
Contracts." As of their respective  filing dates (or if amended or superseded by
a filing prior to the date hereof,  then on the date of such subsequent filing),
the Target SEC Documents complied in all material respects with the requirements
of the Securities  Exchange Act of 1934, as amended (the "Exchange Act") and the
Securities  Act, as applicable,  and none of the Target SEC Documents  contained
any  untrue  statement  of a material  fact or omitted to state a material  fact
required to be stated therein or necessary to make the statements  made therein,
in light of the circumstances in which they were made, not misleading, except to
the extent corrected by a subsequently filed Target SEC Document.  The financial
statements of Target,  including the notes  thereto,  included in the Target SEC
Documents (the "Target  Financial  Statements")  fairly present the consolidated
financial condition and the related  consolidated  statements of operations,  of
stockholder's  equity,  and of cash  flows of Target at the dates and during the
periods  indicated  therein (subject,  in the case of unaudited  statements,  to
normal,  recurring  year-end  adjustments),  complied as to form in all material
respects with applicable  accounting  requirements  and with the published rules
and  regulations of the SEC with respect thereto as of their  respective  dates,
and  have  been  prepared  in  accordance  with  generally  accepted  accounting
principles  applied on a basis consistent  throughout the periods  indicated and
consistent  with each other (except as may be indicated in the notes thereto or,
in the case of unaudited statements included in Quarterly Reports on Form 10-Qs,
as permitted by Form 10-Q and Regulation S-K of the SEC).

     2.5 Absence of Certain  Changes.  Since June 30, 1998, (the "Target Balance
Sheet  Date"),  Target  has  conducted  its  business  in  the  ordinary  course
consistent with past practice and there has not occurred:  (i) any change, event
or  condition  (whether or not covered by  insurance)  that has  resulted in, or
might reasonably be expected to result in, a Material Adverse Effect (as defined
in  Section  8.2) on  Target;  (ii) any  acquisition,  sale or  transfer  of any
material  asset of Target;  (iii) any change in accounting  methods or practices
(including  any change in  depreciation  or  amortization  policies or rates) by
Target or any revaluation by Target of any of its assets;  (iv) any declaration,
setting aside,  or payment of a dividend or other  distribution  with respect to
the shares of Target,  or any direct or indirect  redemption,  purchase or other
acquisition  by Target of any of its  shares of  capital  stock,  except for the
repurchase  at  cost  of  unvested  shares  held  by  Target  employees  on  the
termination  of their  employment;  (v) any  material  contract  entered into by
Target,  other than as  provided  to  Acquiror,  or any  material  amendment  or
termination  of, or default  under,  any material  contract to which Target is a
party or by which it is bound;  (vi) any amendment or change to the  Certificate
of Incorporation  or Bylaws of Target;  (vii) any increase in or modification of
the  compensation  or benefits  payable or to become payable by Target to any of
its directors,  officers, employees or consultants,  other than, with respect to
non-officer  employees and consultants only, any increase or modification in the
ordinary course consistent with past practice; or (viii) any agreement by Target
to do any of the things described in the preceding clauses (i) through (vii).

     2.6 Absence of Undisclosed Liabilities.  Target has no material obligations
or liabilities of any nature (matured or unmatured,  fixed or contingent)  other
than (i) those set forth or adequately provided for in the Balance Sheet for the
period ended June 30, 1998 (the "Target Balance Sheet"),  (ii) those incurred in
the ordinary  course of business  since the Target Balance Sheet Date in amounts
consistent  with prior periods,  and (iii) those incurred in connection with the
execution  of  this  Agreement  and  the   consummation   of  the   transactions
contemplated hereby.

     2.7  Litigation.   There  is  no  private  or  governmental  action,  suit,
proceeding, claim, arbitration or investigation pending before any agency, court
or tribunal,  foreign or domestic,  or, to the  knowledge of Target,  threatened
(including  allegations  that could form the basis for  future  action)  against
Target or any of its properties or officers or directors (in their capacities as
such),  which, if adversely  determined would or could reasonably be expected to
have a Material Adverse Effect on Target. There is no judgment,  decree or order
against Target, or, to the knowledge of Target, any of its directors or officers
(in their capacities as such),  that could prevent,  enjoin, or materially alter
or delay any of the transactions  contemplated by this Agreement,  or that could
reasonably  be  expected  to have a  Material  Adverse  Effect  on  Target.  All
litigation  to  which  Target  is a  party  (or,  to the  knowledge  of  Target,
threatened  to become a party) is  disclosed  in the Target  Disclosure  Letter.
Target does not have any plans to initiate any litigation,  arbitration or other
proceeding against any third party.

     2.8 Restrictions on Business Activities.  There is no agreement,  judgment,
injunction,  order or decree binding upon Target that has or could reasonably be
expected to have the effect of prohibiting or impairing in any material  respect
any current business  practice of Target,  any acquisition of property by Target
or the conduct of business by Target as currently conducted by Target.

     2.9 Governmental  Authorization.  Target has obtained each federal,  state,
county, local or foreign governmental consent,  license, permit, grant, or other
authorization  of a Governmental  Entity (i) pursuant to which Target  currently
operates or holds any interest in any of its properties or (ii) that is required
for the operation of Target's  business or the holding of any such interest ((i)
and (ii) herein  collectively called "Target  Authorizations"),  and all of such
Target  Authorizations are in full force and effect, except where the failure to
obtain or have any such Target  Authorizations  could not reasonably be expected
to have a Material Adverse Effect on Target.

     2.10  Title to  Property.  Target  has good and  valid  title to all of its
properties, interests in properties and assets, real and personal, necessary for
the conduct of its business as presently conducted or which are reflected in the
Target  Balance  Sheet or acquired  after the Target  Balance Sheet Date (except
properties,  interests in properties and assets sold or otherwise disposed of in
the ordinary  course of business since the Target  Balance Sheet Date),  or with
respect to leased properties and assets,  valid leasehold  interests therein, in
each  case  free  and  clear  of  all  mortgages,  liens,  pledges,  charges  or
encumbrances of any kind or character,  except (i) the lien of current taxes not
yet due and payable, (ii) such imperfections of title, liens and easements as do
not and  will  not  materially  detract  from or  interfere  with the use of the
properties subject thereto or affected thereby,  or otherwise  materially impair
business operations involving such properties and (iii) liens securing debt that
are reflected on the Target  Balance  Sheet.  For purposes of this Section 2.10,
the word "property" or "properties" does not include  Intellectual  Property (as
defined in Section 2.11). Target does not own any real property.

     2.11 Intellectual Property.

     (a) Target owns or is licensed for, and in any event  possesses  sufficient
rights with respect to, all Intellectual  Property (defined below) that is used,
exercised,  or exploited ("Used") in, or that may be necessary for, its business
as currently  conducted  ("Target  Intellectual  Property," which term will also
include all other Intellectual Property owned by or licensed to Target now or in
the past) without any material conflict with or infringement or misappropriation
of any rights or property of others ("Infringement").  Such ownership,  licenses
and rights are exclusive (A) except with respect to Inventions  (defined  below)
in the public domain that are not important differentiators of Target's business
and (B) except  with  respect to  standard,  generally  commercially  available,
"off-the-shelf"   third  party   products   (including,   but  not  limited  to,
customizations  of such  products)  that  are not part of any  current  product,
service or  Intellectual  Property  offering of Target.  No Target  Intellectual
Property  owned or  developed by Target was  conceived or developed  directly or
indirectly  with or pursuant to  government  funding or a  government  contract.
"Intellectual Property" means (i) inventions (whether or not patentable);  trade
names, trade marks, service marks, logos and other designations ("Marks"); works
of authorship; mask works; data; technology,  know-how, trade secrets, ideas and
information;  designs; formulas;  algorithms;  processes;  schematics;  computer
software (in source code and/or  object code form);  and all other  intellectual
and industrial  property of any sort ("Inventions") and (ii) patent rights; Mark
rights; copyrights;  mask work rights; sui generis database rights; trade secret
rights;  moral rights; and all other intellectual and industrial property rights
of any sort throughout the world, and all applications, registrations, issuances
and the like with respect thereto ("IP Rights").  With respect to patent rights,
moral rights and Mark rights, the representations and warranties of this Section
2.11(a) are made only to Target's  knowledge.  All  copyrightable  matter within
Target  Intellectual  Property  owned by Target has been  created by persons who
were employees of Target at the time of creation,  or by third parties that have
assigned such  copyrights to Target,  and no third party has or will have "moral
rights" or rights to terminate any  assignment or license with respect  thereto.
Target has not received any written communication  alleging that Target has been
or may be engaged in, liable for or contributing to any  Infringement,  nor does
Target  have  any  reason  to  expect  that  any  such   communication  will  be
forthcoming.

     (b) To the extent included in Target Intellectual  Property and material to
Target's business as currently conducted,  Section 2.11 of the Target Disclosure
Letter lists (by name, number,  jurisdiction,  owner and, where applicable,  the
name and  address  of each  inventor,  all to the extent  known by  Target)  all
patents  and  patent   applications;   all  registered   Marks;  all  registered
copyrights,  all software  programs  material to Target's  business as currently
conducted, and, if material, mask works; and all other issuances, registrations,
applications  and the like  with  respect  to those or any other IP  Rights.  No
cancellation,  termination,  expiration or  abandonment  of any of the foregoing
(except  natural  expiration  or  termination  or in  accordance  with  the laws
governing such  registrations) is anticipated by Target.  Target is not aware of
any material  questions or  challenges  (or any specific  basis  therefor)  with
respect to the validity of any of the  foregoing  issued or registered IP Rights
(or any part or claim thereof).

     (c) There is, to the knowledge of Target, no unauthorized Use,  disclosure,
infringement  or  misappropriation  of any Target  Intellectual  Property by any
third party, including,  without limitation,  any employee or former employee of
Target.

     (d) Target has taken all  reasonable and  appropriate  steps to protect and
preserve the  confidentiality  of all Target owned or licensed trade secrets and
confidential  information  that Target  wishes to protect that is not  otherwise
disclosed in published patents or patent  applications or registered  copyrights
("Target Confidential  Information").  All use by and disclosure to employees or
others of Target  Confidential  Information  has been  pursuant  to the terms of
valid and binding written confidentiality and nonuse/restricted-use  agreements.
Except as set forth in Section 2.11 of the Target Disclosure Letter,  Target has
not disclosed or delivered to any third party,  or permitted  the  disclosure or
delivery to any escrow holder or other person any part of any source code.

     (e) Except  where the  failure  to do so would not have a Material  Adverse
Effect on Target,  each current and former employee and contractor of Target who
is or was involved in, or who has contributed to, the creation or development of
any  Target  Intellectual  Property  has  executed  and  delivered  (and  to the
knowledge  of  Target  is  in  compliance  with)  an  enforceable  agreement  in
substantially  the  form  of  Target's  standard  Proprietary   Information  and
Inventions  Agreement  (in  the  case  of  an  employee)  or  Target's  standard
Consulting Agreement (in the case of a contractor).

     (f) To  Target's  knowledge,  Target  is not  Using,  and  it  will  not be
necessary to Use, (i) any Inventions of any of its past or present  employees or
contractors (or people currently  intended to be hired) made prior to or outside
the scope of their employment by Target or (ii) any confidential  information or
trade secrets of any former employer of any such person.

     2.12  Environmental  Matters.  Target is and has at all times  operated its
business  in material  compliance  with all  Environmental  Laws and to Target's
knowledge,  no material  expenditures are or will be required in order to comply
with  such  Environmental  Laws.   "Environmental  Laws"  means  all  applicable
statutes, rules, regulations,  ordinances,  orders, decrees, judgments, permits,
licenses, consents, approvals,  authorizations, and governmental requirements or
directives or other obligations lawfully imposed by governmental authority under
federal,  state or local law  pertaining to the  protection of the  environment,
protection  of public  health,  protection  of worker  health  and  safety,  the
treatment,  emission and/or  discharge of gaseous,  particulate  and/or effluent
pollutants,  and/or the  handling  of  hazardous  materials,  including  without
limitation,  the Clean Air Act, 42 U.S.C.  ss. 7401, et seq., the  Comprehensive
Environmental  Response,  Compensation and Liability Act of 1980 ("CERCLA"),  42
U.S.C. ss. 9601, et seq., the Federal Water Pollution Control Act, 33 U.S.C. ss.
1321, et seq., the Hazardous  Materials  Transportation Act, 49 U.S.C. ss. 1801,
et seq., the Resource Conservation and Recovery Act, 42 U.S.C. ss. 6901, et seq.
("RCRA"), and the Toxic Substances Control Act, 15 U.S.C. ss. 2601, et seq.

     2.13 Taxes.  Target, and any consolidated,  combined,  unitary or aggregate
group for Tax  purposes of which Target is or has been a member has timely filed
all Tax  Returns  required  to be filed by it (other  than  those  that are not,
individually or in the aggregate, material), has paid all Taxes shown thereon to
be due and has provided adequate accruals in all material respects in accordance
with generally accepted  accounting  principles in its financial  statements for
any Taxes  that  have not been  paid,  whether  or not shown as being due on any
returns. In addition, (i) no material claim for unpaid Taxes that are currently,
or will be  prior to the  Effective  Time,  due and  payable  has  become a lien
against the property or is being asserted  against Target,  (ii) no audit of any
material Tax Return of Target is being  conducted by a Tax  authority,  (iii) no
extension of the statute of  limitations on the assessment of any Taxes has been
granted by Target and is currently in effect, except as a result of obtaining an
extension of time to file a Tax Return, and (iv) there is no agreement, contract
or  arrangement to which Target is a party that may result in the payment of any
amount that would not be deductible pursuant to Sections 280G, 162(a) (by reason
of being  unreasonable  in amount),  162(b)  through (p) or 404 of the Code. For
purposes of this  Agreement,  the following  terms have the following  meanings:
"Tax" (and, with correlative  meaning,  "Taxes" and "Taxable") means any and all
taxes including,  without limitation,  (i) any net income, alternative or add-on
minimum tax, gross income,  gross receipts,  sales,  use, ad valorem,  transfer,
franchise,  profits,  value added,  net worth,  license,  withholding,  payroll,
employment,   excise,   severance,   stamp,   occupation,   premium,   property,
environmental or windfall profit tax, custom, duty or other tax governmental fee
or other like  assessment  or charge of any kind  whatsoever,  together with any
interest or any penalty,  addition to tax or  additional  amount  imposed by any
Governmental  Entity (a "Tax  authority")  responsible for the imposition of any
such tax  (domestic  or  foreign),  (ii) any  liability  for the  payment of any
amounts  of the  type  described  in (i) as a result  of  being a  member  of an
affiliated, consolidated, combined or unitary group for any Taxable period or as
the result of being a transferee  or successor  thereof and (iii) any  liability
for the payment of any amounts of the type  described in (i) or (ii) as a result
of any express or implied  obligation to indemnify any other person.  As used in
this Section 2.13, the term "Target" means Target and any entity included in, or
required under generally accepted  accounting  principles to be included in, any
of the Target Financial Statements.  As used herein, "Tax Return" shall mean any
return, report, statement,  declaration or other form or document required to be
filed with any governmental authority with respect to Taxes.

     2.14 Employee Benefit Plans.

     (a) For all purposes under this Section 2.14 "ERISA  Affiliate"  shall mean
each  person (as  defined  in Section  3(9) of the  Employee  Retirement  Income
Security Act of 1974,  as amended  ("ERISA"))  that,  together  with Target,  is
treated as a single  employer  under Section  4001(b) of ERISA or Section 414 of
the Code.  Except for the plans and  agreements  listed in  Section  2.14 of the
Target  Disclosure  Letter  (collectively,  the  "Plans"),  Target and its ERISA
Affiliates do not maintain, are not a party to, do not contribute to and are not
obligated to contribute to, and employees or former  employees of Target and its
ERISA  Affiliates  and their  dependents  or survivors  do not receive  benefits
under, any of the following (whether or not set forth in a written document):

     (i) Any employee benefit plan, as defined in section 3(3) of ERISA;

     (ii) Any bonus, deferred compensation,  incentive,  restricted stock, stock
purchase,  stock option, stock appreciation right,  phantom stock,  supplemental
pension, executive compensation,  cafeteria benefit, dependent care, director or
employee loan, fringe benefit, sabbatical, severance, termination pay or similar
plan,  program,  policy,  agreement or arrangement;  or (iii) Any plan, program,
agreement,  policy, commitment or other arrangement relating to the provision of
any benefit  described in section 3(1) of ERISA to former employees or directors
or to their  survivors,  other  than  procedures  intended  to  comply  with the
Consolidated  Omnibus Budget  Reconciliation Act of 1985 ("COBRA").  (b) Neither
Target  nor  any  ERISA  Affiliate  has  terminated,   suspended,   discontinued
contributions to or withdrawn from any employee pension benefit plan, as defined
in section 3(2) of ERISA, including (without limitation) any multiemployer plan,
as defined in section 3(37) of ERISA.

     (c) Target has provided to Acquiror  complete,  accurate and current copies
of each of the  following:  

     (i) The text  (including  amendments)  of each of the Plans,  to the extent
reduced to writing;

     (ii) A summary of each of the Plans,  to the extent not previously  reduced
to writing;

     (iii)  With  respect  to each Plan  that is an  employee  benefit  plan (as
defined in section 3(3) of ERISA),  the  following:  

     (1) The most recent summary plan  description,  as described in section 102
of ERISA;

     (2) Any  summary of material  modifications  that has been  distributed  to
participants  but  has  not  been   incorporated  in  an  updated  summary  plan
description furnished under Subparagraph (1) above; and

     (3) The annual  report,  as described  in section 103 of ERISA,  and (where
applicable) actuarial reports, for the three most recent plan years for which an
annual report or actuarial report has been prepared; and

     (iv) With  respect to each Plan that is intended to qualify  under  section
401(a) of the Code the most recent  determination  letter  concerning the plan's
qualification  under  section  401(a)  of the Code,  as  issued by the  Internal
Revenue Service, and any subsequent determination letter application.

     (d) With respect to each Plan that is an employee  benefit plan (as defined
in section 3(3) of ERISA),  the  requirements  of ERISA  applicable to such Plan
have been satisfied,  except to the extent that a failure to satisfy any of such
requirements would not have a Material Adverse Effect.

     (e) With respect to each Plan that is subject to COBRA, the requirements of
COBRA  applicable to such Plan have been satisfied,  except to the extent that a
failure to satisfy any of such  requirements  would not have a Material  Adverse
Effect.

     (f) With respect to each Plan that is subject to the Family  Medical  Leave
Act of 1993, as amended,  the  requirements  of such Act applicable to such Plan
have been satisfied,  except to the extent that a failure to satisfy any of such
requirements would not have a Material Adverse Effect.

     (g) Each Plan that is intended to qualify under section  401(a) of the Code
meets the  requirements for  qualification  under section 401(a) of the Code and
the regulations  thereunder,  except to the extent that such requirements may be
satisfied by adopting  retroactive  amendments  under section 401(b) of the Code
and the  regulations  thereunder.  Each  such  Plan  has  been  administered  in
accordance  with its terms  (or,  if  applicable,  such terms as will be adopted
pursuant to a retroactive  amendment  under section  401(b) of the Code) and the
applicable  provisions  of ERISA  and the Code and the  regulations  thereunder,
except to the  extent  that a  failure  to be so  administered  would not have a
Material Adverse Effect.

     (h) Neither  Target nor any ERISA  Affiliate  has any  accumulated  funding
deficiency  under  section  412 of the  Code or any  termination  or  withdrawal
liability under Title IV of ERISA,  except to the extent that any such liability
would not have a Material Adverse Effect.

     (i) All  contributions,  premiums or other  payments due from the Target to
(or under) any Plan have been fully paid or adequately provided for on the books
and financial statements of Target. All accruals (including,  where appropriate,
proportional  accruals for partial  periods) have been made in  accordance  with
prior practices.

     2.15 Employees and Consultants.

     (a) Target  has  provided  Acquiror  with a true and  complete  list of all
individuals  employed by Target as of the date hereof and the  position and base
compensation  payable  to each such  individual.  The Target  Disclosure  Letter
contains a description of any written or oral employment agreements,  consulting
agreements or  termination  or severance  agreements to which Target is a party,
other than  those  that are  terminable  by Target on no more than  thirty  days
notice without liability or financial obligation.

     (b) Target is not a party to or subject  to a labor  union or a  collective
bargaining  agreement  or  arrangement  and  is not a  party  to  any  labor  or
employment dispute.

     (c) The  consummation  of the  transactions  contemplated  herein  will not
result  in (i)  any  amount  becoming  payable  to  any  employee,  director  or
independent contractor of Target, (ii) the acceleration of payment or vesting of
any  benefit,  option or right to which any  employee,  director or  independent
contractor of Target may be entitled,  (iii) the forgiveness of any indebtedness
of any employee,  director or independent  contractor of Target or (iv) any cost
becoming due or accruing to Target or the Acquiror with respect to any employee,
director or independent contractor of Target.

     (d) Target is not obligated and upon consummation of the Merger will not be
obligated to make any payment or transfer any property  that would be considered
a "parachute payment" under section 280G(b)(2) of the Code.

     (e) To the  knowledge of Target,  no employee of Target has been injured in
the work place or in the  course of his or her  employment  except for  injuries
that are covered by insurance or for which a claim has been made under  workers'
compensation or similar laws.

     (f) Target has  complied in all  material  respects  with the  verification
requirements and the  record-keeping  requirements of the Immigration Reform and
Control Act of 1986 ("IRCA");  to the knowledge of Target,  the  information and
documents on which Target  relied to comply with IRCA are true and correct;  and
there have not been any discrimination  complaints filed against Target pursuant
to IRCA,  and to the  knowledge  of Target,  there is no basis for the filing of
such a complaint  that could  reasonably be expected to have a Material  Adverse
Effect on Target.

     (g)  Target has not  received  or been  notified  of any  complaint  by any
employee, applicant, union or other party of any discrimination or other conduct
forbidden by law or contract,  nor to the knowledge of Target,  is there a basis
for any complaint, except such complaints as could not reasonably be expected to
have a Material Adverse Effect.

     (h) Target's  action in complying with the terms of this Agreement will not
violate any agreements with any of Target's  employees that could  reasonably be
expected to have a Material  Adverse Effect on Target.  

     (i) Target has filed all required  reports and information  with respect to
its employees  that are due prior to the Closing Date and otherwise has complied
in its hiring, employment, promotion, termination and other labor practices with
all  applicable  federal  and  state  law  and  regulations,  including  without
limitation  those within the  jurisdiction of the United States Equal Employment
Opportunity  Commission,  United States  Department of Labor and state and local
human  rights  or civil  rights  agencies,  except to the  extent  that any such
failure to file or comply  would not have a Material  Adverse  Effect on Target.
Target  has filed and  shall  file any such  reports  and  information  that are
required to be filed prior to the Closing Date.

     (j)  Target  is not  aware  that any of its  employees  or  contractors  is
obligated under any agreement, commitments, judgment, decree, order or otherwise
(an "Employee  Obligation")  that could reasonably be expected to interfere with
the use of his or her best  efforts to promote the  interests  of Target or that
could  reasonably  be  expected to  conflict  with any of  Target's  business as
conducted  and that could  reasonably  be  expected  to have a Material  Adverse
Effect on Target.  Neither the execution nor delivery of this  Agreement nor the
conduct of Target's business as conducted, will, to Target's knowledge, conflict
with or  result  in a breach  of the  terms,  conditions  or  provisions  of, or
constitute a default under,  any Employee  Obligation  that could  reasonably be
expected to have a Material Adverse Effect on Target.

     2.16 Insurance.  Target has policies of insurance and bonds of the type and
in amounts customarily carried by persons conducting businesses or owning assets
similar to those of Target. There is no material claim pending under any of such
policies or bonds as to which coverage has been  questioned,  denied or disputed
by the  underwriters  of such  policies or bonds.  All  premiums due and payable
under all such  policies  and bonds  have been paid and Target is  otherwise  in
compliance with the terms of such policies and bonds. Target has no knowledge of
any threatened termination of, or material premium increase with respect to, any
of such policies.

     2.17  Compliance  with Laws.  Target has complied with, is not in violation
of, and has not received any notices of violation  with respect to, any federal,
state,  local or foreign statute,  law or regulation with respect to the conduct
of its business, or the ownership or operation of its business,  except for such
violations or failures to comply as could not be  reasonably  expected to have a
Material Adverse Effect on Target.

     2.18  Brokers'  and Finders'  Fees.  Target has not  incurred,  nor will it
incur,  directly or indirectly,  any liability for brokerage or finders' fees or
agents'  commissions  or  investment  bankers'  fees or any  similar  charges in
connection with this Agreement or any transaction contemplated hereby.

     2.19  Pooling  of  Interests.   To  the  knowledge  of  Target,   based  on
consultation  with its  independent  accountants,  neither Target nor any of its
directors,  officers, affiliates or stockholders has taken any action that could
preclude Acquiror's ability to account for the Merger as a pooling of interests.

     2.20 Voting  Agreement;  Irrevocable  Proxies.  All of the  persons  and/or
entities  deemed   "Affiliates"  of  Target  within  the  meaning  of  Rule  145
promulgated  under the  Securities  Act who are also officers or directors  have
agreed in writing to vote for  approval  of the Merger  pursuant to a Voting and
Proxy  Agreement  attached  hereto  as  Exhibit  C  (collectively,  the  "Voting
Agreements").

     2.21 Vote Required.  The  affirmative  vote of the holders of a majority of
the  Target  Common  Stock  outstanding  on the  record  date set for the Target
Stockholders  Meeting (as hereafter  defined) is the only vote of the holders of
any of Target's  Capital  Stock  necessary  to approve  this  Agreement  and the
transactions contemplated hereby.

     2.22 No Breach of Material  Contracts.  The Target has performed all of the
obligations  required to be  performed  by it and is  entitled  to all  benefits
under,  and is not alleged in  writing,  or, to  Target's  knowledge,  otherwise
alleged to be in default in  respect of any  Material  Contract,  other than any
failure that  individually or in the aggregate would not or could not reasonably
be  expected  to result  in a  material  loss to  Target.  Each of the  Material
Contracts  is in full force and  effect and there  exists no default or event of
default or event,  occurrence,  condition  or act,  with respect to Target or to
Target's  knowledge with respect to the other  contracting  party,  or otherwise
that,  with or  without  the  giving  of  notice,  the  lapse of the time or the
happening of any other event or conditions,  could reasonably be expected to (A)
become a default or event of default under any Material Contract,  which default
or event of default  could  reasonably  be expected  to have a Material  Adverse
Effect on Target or (B) result in the loss or expiration  of any material  right
or option by Target (or the gain  thereof by any third party) under any Material
Contract,  which loss or  expiration  (or gain) could  reasonably be expected to
have a  Material  Adverse  Effect on Target or (C) the  release,  disclosure  or
delivery to any third party of any part of the source  code.  True,  correct and
complete copies of all Material Contracts have been delivered to the Acquiror.

     2.23  Registration  Statement;  Proxy  Statement/Prospectus.   The  written
information  supplied by Target  expressly  for the purpose of  inclusion in the
registration  statement on Form S-4 (or such other or successor form as shall be
appropriate)  pursuant to which the  issuance  of the shares of Acquiror  Common
Stock  to be  issued  in the  Merger  will  be  registered  with  the  SEC  (the
"Registration  Statement")  shall  not at the  time the  Registration  Statement
(including any amendments or supplements  thereto) is declared  effective by the
SEC  contain  any  untrue  statement  of a  material  fact or omit to state  any
material fact necessary in order to make the statements  therein not misleading.
The  written  information  supplied  by  Target  expressly  for the  purpose  of
inclusion in the proxy  statement/prospectus  to be sent to the  stockholders of
Target in  connection  with the meetings of Target's  stockholders  (the "Target
Stockholders  Meeting")  to be held in  connection  with the Merger  (such proxy
statement/prospectus  as amended or  supplemented  is  referred to herein as the
"Proxy Statement") shall not, on the date the Proxy Statement is first mailed to
Target's stockholders, at the time of the Target Stockholders Meeting and at the
Effective  Time,  contain any untrue  statement of a material  fact,  or omit to
state any material fact necessary in order to make the statements  made therein,
in light of the circumstances under which they were made, not misleading.  If at
any time  prior  to the  Effective  Time any  event  or  information  should  be
discovered  by  Target  that  should  be  set  forth  in  an  amendment  to  the
Registration  Statement or a  supplement  to the Proxy  Statement,  Target shall
promptly inform Acquiror and Merger Sub.  Notwithstanding the foregoing,  Target
makes no  representation,  warranty or covenant with respect to any  information
supplied  by Acquiror or Merger Sub that is  contained  in any of the  foregoing
documents.

     2.24 Complete  Copies of Materials.  Target has delivered or made available
true and complete copies of each document that has been requested by Acquiror or
its counsel in connection with their technical,  legal and accounting  review of
Target.

     2.25  Amendment of Rights Plan.  The Target Rights Plan has been amended to
(i) render  the  Target  Rights  Plan  inapplicable  to the Merger and the other
transactions  contemplated by this Agreement,  the Stock Option  Agreement,  the
Target  Affiliate  Agreements  and the Voting  Agreements,  (ii) ensure that (y)
neither  Acquiror nor Merger Sub, nor any of their affiliates shall be deemed to
have become an Acquiring  Person (as defined in the Target Rights Plan) pursuant
to the Target Rights Plan solely by virtue of the  execution of this  Agreement,
the Stock  Option  Agreement,  the Target  Affiliate  Agreements  and the Voting
Agreements  or the  consummation  of the  transactions  contemplated  hereby  or
thereby and (z) a  Distribution  Date,  a Section  11(a)(ii)  Trigger  Date or a
Shares Acquisition Date (as such terms are defined in the Target Rights Plan) or
similar event does not occur by reason of the execution of this  Agreement,  the
Stock  Option  Agreement,   the  Target  Affiliate  Agreements  and  the  Voting
Agreements,  the  consummation of the Merger,  or the  consummation of the other
transactions contemplated hereby and thereby, (iii) provide that the exercise of
rights  under the Target  Rights  Plan  shall  expire  immediately  prior to the
Effective  Time, and (iv) provide that such amendment may not be further amended
by the Target without the prior consent of Acquiror in its sole discretion (such
Target Rights Plan amendment being the "Merger Permissive Amendment").

     2.26  Opinion of Financial  Advisor.  Target has been advised in writing by
its financial  advisor,  Hambrecht & Quist LLC,  that in its opinion,  as of the
date of this Agreement, the Exchange Ratio is fair to the stockholders of Target
from a financial point of view.

     2.27 Board  Approval.  The Board of  Directors  of Target  has  unanimously
(except that Louis Cole, a director of Target, has abstained from voting on such
matters) (i) approved this Agreement and the Merger,  (ii)  determined  that the
Merger is in the best  interest  of the  stockholders  of Target and is on terms
that are fair to such  stockholders and (iii)  recommended that the stockholders
of Target approve this Agreement and the Merger.

     2.28 Section 203 of Delaware Law Not Applicable.  The Board of Directors of
Target has taken all actions so that the  restrictions  contained in Section 203
of the  Delaware  Law  applicable  to a  "business  combination"  (as defined in
Section 203) will not apply to the  execution,  delivery or  performance of this
Agreement or the Stock Option Agreement or the consummation of the Merger or the
other  transactions  contemplated  by  this  Agreement  or by the  Stock  Option
Agreement.

     2.29  Representations  Complete.  None of the representations or warranties
made by Target herein or in any Schedule hereto, including the Target Disclosure
Letter,  or  certificate  furnished by Target  pursuant to this Agreement or the
Target  SEC  Documents,  when all such  documents  are  read  together  in their
entirety, contains or will contain at the Effective Time any untrue statement of
a  material  fact,  or omits or will  omit at the  Effective  Time to state  any
material  fact  necessary in order to make the  statements  contained  herein or
therein, in the light of the circumstances under which made, not misleading.


                                   ARTICLE III


            REPRESENTATIONS AND WARRANTIES OF ACQUIROR AND MERGER SUB

     Acquiror and Merger Sub represent and warrant to Target that the statements
contained in this  Article III are true and correct,  except as set forth (i) in
the Disclosure  Letter delivered by Acquiror to Target to prior to the execution
and delivery of this  Agreement (the  "Acquiror  Disclosure  Letter") or (ii) in
Acquiror's  most  recently  filed Annual  Report on Form 10-K (which  report was
filed with the Securities and Exchange Commission (the "SEC") on March 27, 1998)
and any Acquiror SEC Documents  (as defined in Section 3.4) filed  subsequent to
March 27, 1998. The Acquiror  Disclosure  Letter shall be arranged in paragraphs
corresponding to the numbered and lettered paragraphs  contained in this Article
III, and the  disclosure in any paragraph  shall qualify only the  corresponding
paragraph in this Article III. Any reference in this Article III to an agreement
being  "enforceable"  shall  be  deemed  to be  qualified  to  the  extent  such
enforceability  is  subject  to (i)  laws of  general  application  relating  to
bankruptcy,  insolvency,  moratorium  and the  relief of  debtors,  and (ii) the
availability  of specific  performance,  injunctive  relief and other  equitable
remedies.

     3.1 Organization, Standing and Power. Each of Acquiror and its subsidiaries
is a corporation duly organized, validly existing and in good standing under the
laws of its jurisdiction of organization.  Each of Acquiror and its subsidiaries
has the corporate  power to own its  properties  and to carry on its business as
now being conducted and is duly qualified to do business and is in good standing
in each  jurisdiction  in  which  the  failure  to be so  qualified  and in good
standing  would  have a  Material  Adverse  Effect  on  Acquiror.  Acquiror  has
delivered a true and correct copy of the Certificate of Incorporation and Bylaws
of Acquiror and Merger Sub, each as amended to date, to Target. Neither Acquiror
nor Merger Sub is in violation of any of the  provisions of its  Certificate  of
Incorporation  or Bylaws.  Acquiror  is the owner of all  outstanding  shares of
capital  stock  of each  of its  subsidiaries  and  all  such  shares  are  duly
authorized, validly issued, fully paid and nonassessable. All of the outstanding
shares of capital stock of each such  subsidiary  are owned by Acquiror free and
clear of all liens,  charges,  claims or encumbrances or rights of others. There
are no  outstanding  subscriptions,  options,  warrants,  puts,  calls,  rights,
exchangeable or convertible securities or other commitments or agreements of any
character  relating to the issued or unissued  capital stock or other securities
of any such subsidiary,  or otherwise obligating Acquiror or any such subsidiary
to issue,  transfer,  sell,  purchase,  redeem  or  otherwise  acquire  any such
securities.  Except as disclosed in the  Acquiror SEC  Documents  (as defined in
Section 3.4), Acquiror does not directly or indirectly own any equity or similar
interest in, or any interest convertible or exchangeable or exercisable for, any
equity or similar  interest in, any corporation,  partnership,  joint venture or
other business association or entity.

     3.2 Capital Structure. The authorized capital stock of Acquiror consists of
100,000,000  shares of Common Stock,  $.0001 par value,  and 5,000,000 shares of
Preferred Stock, $.0001 par value, of which there were issued and outstanding as
of  September  30,  1998,  37,286,292  shares of  Common  Stock and no shares of
Preferred  Stock.  There are no other  outstanding  shares of  capital  stock or
voting  securities of Acquiror other than shares of Acquiror Common Stock issued
after  September  30,  1998,  upon (i) the  exercise  of  options  issued  under
Acquiror's  1995 Stock  Option/Stock  Issuance Plan (the "Acquiror  Stock Option
Plan") or (ii) the exercise of subscription  rights  outstanding as of such date
under the Acquiror  Employee  Stock  Purchase Plan (the  "Acquiror  ESPP").  The
authorized capital stock of Merger Sub consists of 1,000 shares of Common Stock,
$.0001  par  value,  all of which are  issued  and  outstanding  and are held by
Acquiror. All outstanding shares of Acquiror have been duly authorized,  validly
issued,  fully paid and are  nonassessable and free of any liens or encumbrances
other than any liens or  encumbrances  created by or  imposed  upon the  holders
thereof and are not subject to  preemptive  rights,  rights of first  refusal or
other similar rights created by statute,  the  Certificate of  Incorporation  or
Bylaws of Acquiror or Merger Sub or any  agreement  to which  Acquiror or Merger
Sub is a party or by which it is bound.  As of September 30, 1998,  Acquiror had
reserved  (i)  12,450,982  shares of Common  Stock for  issuance  to  employees,
directors  and  independent  contractors  pursuant to the Acquiror  Stock Option
Plan, of which 5,407,175 shares are subject to outstanding, unexercised options,
and (ii) 1,600,000 shares of Common Stock for issuance to employees  pursuant to
the Acquiror  ESPP,  of which 929,113  shares are available for issuance.  Other
than as set  forth  above and the  commitment  to issue  shares of Common  Stock
pursuant to this Agreement; there are no other options, warrants, calls, rights,
commitments  or agreements of any character to which Acquiror or Merger Sub is a
party or by which either of them is bound  obligating  Acquiror or Merger Sub to
issue, deliver,  sell,  repurchase or redeem, or cause to be issued,  delivered,
sold,  repurchased  or redeemed,  any shares of the capital stock of Acquiror or
Merger Sub or obligating  Acquiror or Merger Sub to grant,  extend or enter into
any such option,  warrant, call, right,  commitment or agreement.  The shares of
Common  Stock to be  issued  pursuant  to the  Merger  will be duly  authorized,
validly  issued,  fully  paid,  and  non-assessable,  will not be subject to any
preemptive  or  other  statutory  right  of  stockholders,  will  be  issued  in
compliance with applicable  U.S.  Federal and state  securities laws and will be
free of any liens or encumbrances  other than any liens or encumbrances  created
by or imposed upon the holders thereof.

     3.3 Authority.

     (a) Each of Acquiror and Merger Sub has all requisite  corporate  power and
authority to enter into this Agreement and the other  Transaction  Documents and
to consummate the transactions  contemplated  hereby and thereby.  The execution
and  delivery of this  Agreement  and the other  Transaction  Documents  and the
consummation of the transactions  contemplated hereby and thereby have been duly
authorized by all necessary corporate action on the part of each of Acquiror and
Merger Sub. This  Agreement and the other  Transaction  Documents have been duly
executed and  delivered by each of Acquiror  and Merger Sub and  constitute  the
valid and binding  obligations  of each of Acquiror and Merger Sub,  enforceable
against Acquiror and Merger Sub in accordance with their terms.

     (b) The execution and delivery of this Agreement and the other  Transaction
Documents do not, and the consummation of the transactions  contemplated  hereby
and thereby will not,  conflict  with, or result in any violation of, or default
under  (with or  without  notice or lapse of time,  or both),  or give rise to a
right of termination,  cancellation or acceleration of any obligation or loss of
a benefit under,  or require a consent to assignment or a novation under (i) any
provision of the  Certificate of  Incorporation  or Bylaws of Acquiror or any of
its  subsidiaries,   as  amended,  or  (ii)  any  contract,  agreement,  permit,
concession,   franchise,   license,   judgment,  order,  decree,  statute,  law,
ordinance,  rule or regulation applicable to Acquiror or any of its subsidiaries
or any of their properties or assets, except in the case of clause (ii) as would
not have a Material Adverse Effect on Acquiror and its subsidiaries,  taken as a
whole.

     (c) No  consent,  approval,  order or  authorization  of, or  registration,
declaration  or filing with,  any  Governmental  Entity,  is required by or with
respect to Acquiror or any of its  subsidiaries in connection with the execution
and delivery of this Agreement or the other Transaction Documents by Acquiror or
the consummation by Acquiror of the transactions contemplated hereby or thereby,
except  for (i) the  filing of the  Certificate  of  Merger,  together  with the
required officers' certificates,  as provided in Section 1.2, (ii) the filing of
a Form 8-K with the SEC and National  Association of Securities Dealers ("NASD")
within 15 days after the  Closing  Date,  (iii) any  filings as may be  required
under  applicable  state  securities laws and the securities laws of any foreign
country, (iv) such filings as may be required under HSR, (v) the filing with the
Nasdaq National Market of a Notification  Form for Listing of Additional  Shares
with respect to the shares of Acquiror  Common Stock issuable upon conversion of
the Target  Capital  Stock in the Merger and upon  exercise of the options under
the  Target  Stock  Option  Plans  assumed by  Acquiror,  (vi) the filing of the
Registration  Statement  with the SEC in accordance  with the  Securities Act of
1933,  as  amended,  and (vii) such  other  consents,  authorizations,  filings,
approvals  and  registrations  that,  if not obtained or made,  would not have a
Material  Adverse Effect on Acquiror and would not prevent,  materially alter or
delay the consummation of the Merger.

     3.4 SEC  Documents;  Financial  Statements.  Acquiror has made available to
Target  a true  and  complete  copy  of  each  statement,  report,  registration
statement  (with the prospectus in the form filed pursuant to Rule 424(b) of the
Securities Act), definitive proxy statement, and other filing filed with the SEC
by Acquiror since January 1, 1997,  and, prior to the Effective  Time,  Acquiror
will have  furnished  Target  with true and  complete  copies of any  additional
documents   filed  with  the  SEC  by  Acquiror  prior  to  the  Effective  Time
(collectively,  the "Acquiror SEC  Documents").  In addition,  Acquiror has made
available to Target all exhibits to the  Acquiror SEC  Documents  filed prior to
the date hereof,  and will promptly make available to Target all exhibits to any
additional  Acquiror  SEC  Documents  filed  prior to the  Effective  Time.  All
documents  required to be filed as exhibits to the Acquiror SEC  Documents  have
been so filed, and all Material Contracts so filed as exhibits are in full force
and effect,  except those that have expired in accordance with their terms,  and
neither  Acquiror nor any of its subsidiaries is in default  thereunder,  except
for any such default that  individually  or in the aggregate  would not or could
not reasonably be expected to have a Material Adverse Effect on Acquiror.  As of
their respective  filing dates (or if amended or superseded by a filing prior to
the date hereof, then on the date of such subsequent  filing),  the Acquiror SEC
Documents  complied  in all  material  respects  with  the  requirements  of the
Exchange Act and the  Securities  Act,  and none of the  Acquiror SEC  Documents
contained any untrue statement of a material fact or omitted to state a material
fact  required to be stated  therein or  necessary to make the  statements  made
therein,  in light of the circumstances in which they were made, not misleading,
except to the extent  corrected by a  subsequently  filed Acquiror SEC Document.
The financial statements of Acquiror,  including the notes thereto,  included in
the Acquiror SEC Documents (the "Acquiror Financial  Statements") fairly present
the consolidated financial condition and the related consolidated  statements of
operations,  of stockholder's equity, and of cash flows of Acquiror at the dates
and during the periods  indicated  therein  (subject,  in the case of  unaudited
statements,  to normal, recurring year-end adjustments),  complied as to form in
all material  respects  with  applicable  accounting  requirements  and with the
published  rules and  regulations  of the SEC with  respect  thereto as of their
respective  dates, and have been prepared in accordance with generally  accepted
accounting  principles  applied on a basis  consistent  throughout  the  periods
indicated  and  consistent  with each other  (except as may be  indicated in the
notes  thereto or, in the case of  unaudited  statements  included in  Quarterly
Reports on Form 10-Qs, as permitted by Form 10-Q and Regulation S-K of the SEC).

     3.5 Absence of Certain Changes.  Since June 30, 1998 (the "Acquiror Balance
Sheet  Date"),  Acquiror  has  conducted  its  business in the  ordinary  course
consistent  with past practice and there has not occurred any (i) change,  event
or  condition  (whether or not covered by  insurance)  that has  resulted in, or
might reasonably be expected to result in, a Material Adverse Effect on Acquiror
or (ii)  any  change  by  Acquiror  in its  accounting  methods,  principles  or
properties.

     3.6 Litigation. Except as disclosed in the Acquiror SEC Documents, there is
no private or  governmental  action,  suit,  proceeding,  claim,  arbitration or
investigation pending before any agency, court or tribunal, foreign or domestic,
or, to the knowledge of Acquiror or any of its subsidiaries,  threatened against
Acquiror or any of its subsidiaries or any of their respective properties or any
of their  respective  officers or directors (in their  capacities as such) that,
individually  or in the  aggregate,  could  reasonably  be  expected  to  have a
Material  Adverse  Effect on  Acquiror.  There is no  judgment,  decree or order
against  Acquiror or any of its subsidiaries or, to the knowledge of Acquiror or
any of its subsidiaries, any of their respective directors or officers (in their
capacities as such) that could prevent, enjoin, or materially alter or delay any
of the transactions  contemplated by this Agreement, or that could reasonably be
expected to have a Material Adverse Effect on Acquiror.

     3.7  Compliance  with  Laws.  Each of  Acquiror  and its  subsidiaries  has
complied  with,  is not in  violation  of, and has not  received  any notices of
violation with respect to, any federal,  state, local or foreign statute, law or
regulation  with  respect to the conduct of its  business,  or the  ownership or
operation of its business,  except for such  violations or failures to comply as
could not be reasonably expected to have a Material Adverse Effect on Acquiror.

     3.8 Registration  Statement.  The written information  supplied by Acquiror
and Merger  Sub  expressly  for the  purpose of  inclusion  in the  Registration
Statement  shall not,  at the time the  Registration  Statement  (including  any
amendments or supplements thereto) is declared effective by the SEC, contain any
untrue statement of a material fact or omit to state any material fact necessary
in order to make the statements  therein,  in light of the  circumstances  under
which they were made, not misleading. If at any time prior to the Effective Time
any event or  information  should be  discovered  by Acquiror or Merger Sub that
should be set forth in an amendment to the Registration  Statement  Acquiror and
Merger Sub will promptly inform Target.  Notwithstanding the foregoing,  neither
Acquiror  nor Merger Sub make any  representation,  warranty  or  covenant  with
respect to any  information  supplied by Target that is  contained in any of the
foregoing documents.

     3.9 Board Approval.  The Board of Directors of Acquiror and Merger Sub have
unanimously  approved this  Agreement and the Merger  (except that Louis Cole, a
director of Acquiror, shall have abstained from voting on such matters).

     3.10 Representations Complete. None of the representations, warranties or
statements  made by  Acquiror  or Merger Sub herein or in any  Schedule  hereto,
including the Acquiror  Disclosure Letter, or certificate  furnished by Acquiror
pursuant  to this  Agreement,  or the  Acquiror  SEC  Documents,  when  all such
documents are read together in their  entirety,  contains or will contain at the
Effective Time any untrue statement of a material fact, or omits or will omit at
the  Effective  Time to state any material  fact  necessary in order to make the
statements  contained herein or therein, in the light of the circumstances under
which made, not misleading.

     3.11  Intellectual  Property.  Acquiror  and  its  subsidiaries  own or are
licensed  for and in any event  possess  sufficient  rights with  respect to all
Intellectual  Property  that is Used  in,  or that  may be  necessary  for,  the
business of Acquiror and its subsidiaries as currently conducted by Acquiror and
its subsidiaries ("Acquiror Intellectual  Property"),  except to the extent that
the  failure  to have  such  rights  have not had and would  not  reasonably  be
expected to have a Material  Adverse  Effect on Acquiror.  Acquiror's  rights to
Acquiror  Intellectual  Property is without any conflict with or infringement or
misappropriation  of any rights or  property of others.  With  respect to patent
rights, moral rights and Mark rights, the representations and warranties of this
Section 3.11 are make only to Acquiror's knowledge.

     3.12  Pooling  of  Interest.  To  the  knowledge  of  Acquiror,   based  on
consultation with its independent  accountants,  neither Acquiror nor any of its
subsidiaries,  directors,  officers,  affiliates or  stockholders  has taken any
action  that could  preclude  Acquiror's  ability to account for the Merger as a
pooling of interests.

     3.13 Interim Operations of Merger Sub. Merger Sub was formed solely for the
purpose of engaging in the transactions  contemplated  hereby, has engaged in no
other business  activities and has conducted its operations only as contemplated
hereby.


                                   ARTICLE IV


                       CONDUCT PRIOR TO THE EFFECTIVE TIME

     4.1 Conduct of Business of Target and Acquiror.  During the period from the
date of this  Agreement and continuing  until the earlier of the  termination of
this Agreement or the Effective Time,  Target and Acquiror each agree (except to
the extent  expressly  contemplated  by this  Agreement  or as  consented  to in
writing by the other,  which consent  shall not be  unreasonably  withheld),  to
carry on its and its subsidiaries'  business in the usual,  regular and ordinary
course in substantially the same manner as heretofore conducted.  Target further
agrees to (i) pay and to cause its subsidiaries to pay debts and Taxes when due,
subject to good  faith  disputes  over such debts or Taxes,  and (ii) to use all
reasonable efforts consistent with past practice and policies to preserve intact
its and its  subsidiaries'  present business  organizations,  keep available the
services of its and its  subsidiaries'  present  officers and key  employees and
preserve its and its  subsidiaries'  relationships  with  customers,  suppliers,
distributors,  licensors, licensees, and others having business dealings with it
or its  subsidiaries.  Target and Acquiror agree to promptly notify the other of
any event or occurrence not in the ordinary  course of its or its  subsidiaries'
business,  and of any event that could have a Material Adverse Effect on it on a
consolidated basis.

     4.2 Conduct of Business of Target.  During the period from the date of this
Agreement and continuing  until the earlier of the termination of this Agreement
or the Effective Time, except as expressly  contemplated by this Agreement or as
set forth in the Target Disclosure Letter,  Target shall not do, cause or permit
any of the following,  or allow,  cause or permit any of its subsidiaries to do,
cause or permit  any of the  following,  without  the prior  written  consent of
Acquiror:

     (a) Charter Documents. Cause or permit any amendments to its Certificate of
Incorporation or Bylaws;

     (b) Dividends; Changes in Capital Stock. Declare or pay any dividends on or
make any other distributions  (whether in cash, stock or property) in respect of
any of its capital  stock,  or split,  combine or reclassify  any of its capital
stock or issue or authorize the issuance of any other  securities in respect of,
in lieu of, or in  substitution  for, shares of its capital stock, or repurchase
or otherwise acquire,  directly or indirectly,  any shares of its capital stock,
except from former  employees,  directors and  consultants  in  accordance  with
agreements  providing  for the  repurchase  of  shares  in  connection  with any
termination of service to it or its subsidiaries; or

     (c)  Material  Contracts.  Enter  into any  material  contract,  agreement,
license or commitment, or violate, amend or otherwise modify or waive any of the
terms of any of its material  contracts,  agreements or licenses,  other than in
the ordinary course of business and consistent with past practice;

     (d) Stock  Option  Plans,  etc.  Accelerate,  amend or change the period of
exercisability  or vesting of options or other  rights  granted  under its stock
plans or  authorize  cash  payments in exchange  for any options or other rights
granted under any of such plans;

     (e) Issuance of Securities.  Issue, deliver or sell or authorize or propose
the  issuance,  delivery or sale of, or purchase or propose the purchase of, any
shares of its capital stock or securities  convertible  into, or  subscriptions,
rights,  warrants or options to acquire,  or other  agreements or commitments of
any  character  obligating  it to issue  any such  shares  or other  convertible
securities,  other than the (i) issuance of shares of its Common Stock  pursuant
to the exercise of stock options,  warrants or other rights therefor outstanding
as of the date of this  Agreement,  (ii) shares of its Common Stock  issuable to
participants  in its ESPP  consistent  with the  terms  thereof,  and  (iii) the
granting  of stock  options  (and the  issuance  of its  Common  Stock  upon the
exercise  thereof)  in the  ordinary  course of  business  consistent  with past
practice,  in an amount not to exceed  options to purchase  (and the issuance of
its Common Stock upon the exercise  thereof)  200,000  shares in the  aggregate,
with not more than options to purchase 15,000 shares to any one individual;

     (f) Intellectual  Property.  Transfer to or license any person or entity or
otherwise  extend,  amend or modify in any  material  respect  any rights to its
Intellectual  Property,  other than the grant of  non-exclusive  licenses in the
ordinary course of business and consistent with past practice;

     (g) Exclusive Rights.  Enter into or amend any agreements pursuant to which
any other party is granted exclusive marketing, manufacturing or other exclusive
rights of any type or scope with respect to any of its products or technology;

     (h) Dispositions.  Sell, lease, license or otherwise dispose of or encumber
any of its  properties  or  assets  that are  material,  individually  or in the
aggregate, to its and its subsidiaries' business, taken as a whole, except sales
or licenses of product or inventory in the ordinary  course and consistent  with
past practice;

     (i)  Indebtedness.  Incur or commit to incur any  indebtedness for borrowed
money or guarantee any such indebtedness or issue or sell any debt securities or
guarantee any debt securities of others;

     (j) Leases.  Enter into any operating lease requiring payments in excess of
$100,000;

     (k)  Payment  of  Obligations.  Pay,  discharge  or satisfy in an amount in
excess of  $100,000 in any one case or  $500,000  in the  aggregate,  any claim,
liability or obligation (absolute,  accrued, asserted or unasserted,  contingent
or otherwise) arising other than in the ordinary course of business,  other than
the payment,  discharge or  satisfaction  of  liabilities  reflected or reserved
against in the Target Financial Statements and (ii) banking,  accounting,  legal
and printing fees associated with the transactions contemplated hereby;

     (l) Capital Expenditures. Incur or commit to incur any capital expenditures
in excess of $200,000 in the aggregate;

     (m)  Insurance.  Reduce the amount of any  insurance  coverage  provided by
existing insurance policies;

     (n) Employee Benefits;  Severance.  Take any of the following actions:  (i)
increase or agree to increase the  compensation  payable or to become payable to
its  officers  or  employees,  except  for  increases  in  salary  or  wages  of
non-officer  employees in the ordinary  course of business and  consistent  with
past  practice,  (ii) grant any additional  severance or termination  pay to, or
enter into any employment or severance agreements with, any officer or employee,
except pursuant to written  agreements  outstanding or policies  existing on the
date  hereof  (Target  also  agrees  that  prior to paying  any  termination  or
severance  payments  to any  officers,  director-level  employees  or  technical
personal,  Target  will  first  consult  with  Acquiror),  (iii)  enter into any
collective bargaining  agreement,  or (iv) other than offer letters entered into
in the ordinary course of business  consistent with past practice with employees
who are  terminable  "at  will,"  establish,  adopt,  enter into or amend in any
material respect any bonus, profit sharing, thrift, compensation,  stock option,
restricted  stock,  pension,  retirement,  deferred  compensation,   employment,
termination, severance or other plan, trust, fund, policy or arrangement for the
benefit of any directors, officers or employees;

     (o) Lawsuits.  Commence a lawsuit or arbitration  proceeding other than (i)
for the routine  collection of bills,  (ii) in such cases where it in good faith
determines that failure to commence suit would result in the material impairment
of a valuable  asset of its  business,  provided  that it consults with Acquiror
prior to the filing of such a suit, or (iii) for a breach of this Agreement;

     (p)  Acquisitions.  Acquire or agree to acquire by merging or consolidating
with, or by  purchasing a substantial  portion of the assets of, or by any other
manner,  any  business or any  corporation,  partnership,  association  or other
business  organization  or division  thereof,  or otherwise  acquire or agree to
acquire any assets that are material,  individually or in the aggregate,  to its
and its subsidiaries' business, taken as a whole;

     (q) Taxes. Make any material Tax election other than in the ordinary course
of business and consistent with past practice, change any material Tax election,
adopt any Tax  accounting  method other than in the ordinary  course of business
and consistent with past practice,  change any Tax accounting  method,  file any
Tax  return  (other  than any  estimated  tax  returns,  immaterial  information
returns,  payroll tax returns or sales tax  returns) or any  amendment  to a Tax
return, enter into any closing agreement,  settle any Tax claim or assessment or
consent  to any Tax  claim  or  assessment  provided  that  Acquiror  shall  not
unreasonably withhold or delay approval of any of the foregoing actions;

     (r) Pooling. Take any action that could be reasonably expected to interfere
with  Acquiror's  ability  to account  for the Merger as a pooling of  interests
under generally  accepted  accounting  principles;  (s) Revaluation.  Materially
revalue any of its assets,  including without  limitation writing down the value
of  inventory  or writing  off notes or  accounts  receivable  other than in the
ordinary course of business, except as required by generally accepted accounting
principles; or

     (t)  Other.  Take or agree in  writing  or  otherwise  to take,  any of the
actions described in Sections 4.2(a) through (s) above.

     4.3  Conduct of Business  of  Acquiror.  During the period from the date of
this  Agreement  and  continuing  until the earlier of the  termination  of this
Agreement  or the  Effective  Time,  except as  expressly  contemplated  by this
Agreement or as set forth in the Acquiror Disclosure Letter,  Acquiror shall not
do, cause or permit any of the following,  or allow,  cause or permit any of its
subsidiaries  to do,  cause or permit any of the  following,  without  the prior
written consent of Target (which consent shall not be unreasonably withheld):

     (a) Dividends. Declare, set aside or pay any dividends on or make any other
distributions (whether in cash, stock, equity securities or property) in respect
of any capital stock, or split, combine or reclassify any capital stock or issue
or authorize the issuance of any other  securities in respect of, in lieu of, or
in substitution  for any capital stock,  except that Acquiror may effect a stock
split  (including a stock split effected in the form of a stock dividend) if the
Board of  Directors  of  Acquiror  determines  that  such  action is in the best
interest of Acquiror;

     (b) Pooling. Take any action that could reasonably be expected to interfere
with  Acquiror's  ability  to account  for the Merger as a pooling of  interests
under generally accepted accounting principles.  4.4 Notices.  Target shall give
all  notices and other  information  required  to be given to the  employees  of
Target,  any collective  bargaining unit  representing any group of employees of
Target,  and any  applicable  government  authority  under  the  National  Labor
Relations  Act, the Internal  Revenue  Code,  the  Consolidated  Omnibus  Budget
Reconciliation Act, and other applicable law in connection with the transactions
provided for in this Agreement.


                                    ARTICLE V


                              ADDITIONAL AGREEMENTS

     5.1 No Solicitation

     (a)  Target  shall  not,  directly  or  indirectly,  through  any  officer,
director, employee, financial advisor, attorney,  representative,  subsidiary or
agent of such party (i) take any action to solicit,  initiate or  encourage  any
inquiries or proposals that constitute,  or could reasonably be expected to lead
to, a proposal or offer for a merger, consolidation,  business combination, sale
of  substantial  assets,  sale of shares of  capital  stock  (including  without
limitation by way of a tender offer) or similar transaction  involving Target or
any of its  subsidiaries,  other  than  the  transactions  contemplated  by this
Agreement (any of the foregoing inquiries or proposals being referred to in this
Agreement  as an  "Acquisition  Proposal"),  or (ii) engage in  negotiations  or
discussions  concerning,  or provide any non-public information to any person or
entity relating to, any Acquisition Proposal; provided, however, that Target may
make reference to and provide a copy of this Section 5.1 to any person or entity
that makes an unsolicited inquiry and provided further that nothing contained in
this Agreement  shall prevent Target,  or its Board of Directors,  to the extent
such Board of Directors  determines,  in good faith, after consultation with and
not  inconsistent  with the advice of outside legal counsel,  that such Board of
Directors'  fiduciary  duties  under  applicable  law  require it to do so, from
furnishing   non-public   information  to,  or  entering  into   discussions  or
negotiations with, any person or entity in connection with an unsolicited,  bona
fide,  written  Acquisition  Proposal by such person or entity that the Board of
Directors  believes  is  reasonably  likely to lead to a Superior  Proposal  (as
hereafter  defined),  if and only to the extent that,  prior to furnishing  such
non-public  information to, or entering into  discussions or negotiations  with,
such  person or entity,  the Board of  Directors  receives  from such  person or
entity an executed  confidentiality  agreement  with terms no more  favorable to
such party than those contained in the  Confidentiality  Agreement dated October
22, 1998 between  Acquiror and Target (the  "Confidentiality  Agreement"),  such
non-public  information has been previously  delivered to the Board of Directors
of  Acquiror,  and  Target  advises  the  Acquiror  hereto  in  writing  of such
disclosure or discussions or negotiations, including the party to whom disclosed
or with whom  discussions  or  negotiations  will occur.  Without  limiting  the
foregoing, it is understood that any violations of the restrictions set forth in
this paragraph by any officer, director,  employee, financial advisor, attorney,
representative,  subsidiary or agent of Target,  whether or not acting on behalf
of Target, shall be deemed to be a breach of this Section 5.1 by Target.

     (b) Except as permitted by this Section 5.1, neither the Board of Directors
of Target nor any committee  thereof shall agree to or recommend any Acquisition
Proposal or  withdraw  or modify its  recommendation  of this  Agreement  or the
Merger in any manner  adverse to  Acquiror or Merger  Sub.  Notwithstanding  the
foregoing,  the  Board of  Directors  of  Target or any  committee  thereof  may
recommend  an  unsolicited,  bona  fide,  written  Acquisition  Proposal  to the
stockholders  of  Target,  or  withdraw  or modify  its  recommendation  of this
Agreement and the Merger, in connection with an unsolicited,  bona fide, written
Acquisition  Proposal, if and only to the extent that (1) the Board of Directors
of Target believes in its good faith  reasonable  judgment  (after  consultation
with  and not  inconsistent  with  the  advice  of  outside  legal  counsel  and
independent  financial  advisors) that such  Acquisition  Proposal is reasonably
capable of being  completed on the terms proposed and, after taking into account
the  strategic  benefits  anticipated  to be  derived  from the  Merger  and the
long-term  prospects  of  Acquiror  and Target as a combined  company  and other
factors  deemed  relevant  by the  Board  of  Directors  of  Target,  would,  if
consummated,  result in a transaction  more favorable from a financial  point of
view  than  the  transaction  contemplated  by this  Agreement  (any  such  more
favorable  Acquisition  Proposal  being  referred  to  in  this  Agreement  as a
"Superior  Proposal")  and the Board of Directors of Target  determines  in good
faith after  consultation  with and not inconsistent  with the advice of outside
legal  counsel  that such action is  necessary  for such Board of  Directors  to
comply with its fiduciary  duties to stockholders  under applicable law. Without
limiting the foregoing, it is understood that any violations of the restrictions
set  forth in this  paragraph  by any  officer,  director,  employee,  financial
advisor, attorney, representative, subsidiary or agent of Target, whether or not
acting on behalf of Target,  shall be deemed to be a breach of this  Section 5.1
by Target.

     (c) Nothing  contained in this  Section 5.1 or elsewhere in this  Agreement
shall prohibit Target from taking and disclosing to its  stockholders a position
contemplated  by rules 14d-9 and 14e-2(a)  promulgated  under the Exchange  Act;
provided  that  neither  Target  nor its Board of  Directors  nor any  committee
thereof  shall,  except in accordance  with the  provisions  of Section  5.1(b),
withdraw or modify its position with respect to this  Agreement or the Merger or
recommend a Superior Proposal.

     (d) Target shall notify  Acquiror  immediately  after receipt by Target (or
its  advisors)  of any  Acquisition  Proposal  or  any  request  for  non-public
information  in  connection  with an  Acquisition  Proposal or for access to the
properties,  books or records of such  party or any of its  subsidiaries  by any
person or entity that informs such party that it is considering  making,  or has
made, an Acquisition  Proposal.  Such notice shall be made orally and in writing
and shall  indicate  in  reasonable  detail the  identity of the offeror and the
terms and conditions of such proposal, inquiry or contact. Target shall continue
to keep  Acquiror  informed,  on a  current  basis,  of the  status  of any such
discussions or negotiations and the terms being discussed or negotiated.

     5.2 . As promptly as  practicable  after the  execution of this  Agreement,
Target and Acquiror  shall prepare proxy  materials  relating to the approval of
the Merger  and the  transactions  contemplated  hereby by the  stockholders  of
Target  and,  as promptly  as  practicable,  Acquiror  shall file with the SEC a
Registration  Statement on Form S-4 (or such other or successor form as shall be
appropriate),   which  complies  in  form  and  substance  with  applicable  SEC
requirements  (and, if  necessary,  will file an amendment or amendments to such
filing to comply with applicable SEC requirements,  provided that neither Target
nor its Board of Directors nor any committee thereof shall, except in accordance
with the  provisions  of Section  5.1(b),  withdraw or modify its position  with
respect to this  Agreement or the Merger or recommend a Superior  Proposal)  and
shall use all reasonable  efforts to cause the Registration  Statement to become
effective as soon thereafter as practicable;  provided,  however,  that Acquiror
shall have no  obligation  to agree to account for the Merger as a "purchase" in
order to cause  the  Registration  Statement  to  become  effective.  The  Proxy
Statement shall include the unanimous  recommendation  of the Board of Directors
of Target in favor of the Merger  (except that Louis Cole, a director of Target,
shall have abstained from voting on such matter);  except to the extent that the
board of Directors of Target shall have modified or withdrawn its recommendation
with respect to this Agreement or the Merger in accordance with Section 5.1(b).

     5.3 Stockholders Meeting.  Promptly after the date hereof, Target will take
all action  necessary in  accordance  with Delaware Law and its  Certificate  of
Incorporation  and Bylaws to convene a meeting of the  stockholders of Target to
be held as promptly as practicable,  and in any event (to the extent permissible
under  applicable law) within 45 days after the declaration of  effectiveness of
the  Registration  Statement,  for the purpose of voting upon this Agreement and
the  Merger.  Subject to  Section  5.1(b),  Target  will,  through  its Board of
Directors,  unanimously  recommend to its stockholders  approval of such matters
(except that Louis Cole, a director of Target,  shall have abstained from voting
on such matters).  Target shall use all  reasonable  efforts to solicit from its
stockholders  proxies with respect to such matters  (whether or not the Board of
Directors   of  Target  shall  have   withdrawn   or  modified   its   unanimous
recommendation of this Agreement or the Merger).

     5.4 Access to Information.

     (a) Target shall afford  Acquiror  and its  accountants,  counsel and other
representatives,  reasonable  access  during  normal  business  hours during the
period prior to the Effective Time to (i) all of Target's and its  subsidiaries'
properties,  books,  contracts,  commitments  and  records,  and (ii) all  other
information concerning the business,  properties and personnel of Target and its
subsidiaries  as Acquiror may  reasonably  request.  Target agrees to provide to
Acquiror  and its  accountants,  counsel  and  other  representatives  copies of
internal financial statements promptly upon request.

     (b) Subject to compliance  with  applicable law, from the date hereof until
the  Effective  Time,  each of Acquiror and Target shall confer on a regular and
frequent  basis with one or more  representatives  of the other  party to report
operational matters of materiality and the general status of ongoing operations.


     (c) No information or knowledge  obtained in any investigation  pursuant to
this  Section  5.4 shall  affect or be deemed to modify  any  representation  or
warranty contained herein or the conditions to the obligations of the parties to
consummate the Merger.


     5.5 Confidentiality.  The parties acknowledge that Acquiror and Target have
previously  executed a Confidentiality  Agreement,  which shall continue in full
force and effect in accordance with its terms.

     5.6  Public  Disclosure.  Unless  otherwise  permitted  by this  Agreement,
Acquiror  and Target  shall  consult  with each other  before  issuing any press
release or otherwise  making any public statement or making any other public (or
non-confidential)  disclosure  (whether  or  not  in  response  to  an  inquiry)
regarding the terms of this Agreement and the transactions  contemplated hereby,
and neither  shall issue any such press  release or make any such  statement  or
disclosure  without the prior approval of the other (which approval shall not be
unreasonably  withheld),  except as may be required by law or to comply with the
rules and  regulations  of the SEC or any  obligations  pursuant  to any listing
agreement with any national securities exchange or with the NASD.

     5.7 Consents; Cooperation.

     (a) Each of Acquiror and Target shall promptly apply for or otherwise seek,
and use reasonable  efforts to obtain, all consents and approvals required to be
obtained by it for the  consummation  of the Merger,  including  those  required
under HSR, and shall use  reasonable  efforts to obtain all necessary  consents,
waivers and approvals  under, or to deliver notice of the Merger as required by,
any of its material  contracts in connection  with the Merger for the assignment
thereof or otherwise.  The parties  hereto will consult and  cooperate  with one
another, and consider in good faith the views of one another, in connection with
any analyses, appearances, presentations, memoranda, briefs, arguments, opinions
and  proposals  made  or  submitted  by or on  behalf  of any  party  hereto  in
connection  with  proceedings  under or relating to HSR or any other  federal or
state antitrust or fair trade law.

     (b) Each of Acquiror and Target shall use all reasonable efforts to resolve
such  objections,  if any, as may be asserted  by any  Governmental  Entity with
respect to the  transactions  contemplated  by this  Agreement  under  HSR,  the
Sherman  Act,  as  amended,  the Clayton  Act,  as  amended,  the Federal  Trade
Commission Act, as amended,  and any other Federal,  state or foreign  statutes,
rules, regulations, orders or decrees that are designed to prohibit, restrict or
regulate actions having the purpose or effect of  monopolization or restraint of
trade  (collectively,   "Antitrust  Laws").  In  connection  therewith,  if  any
administrative  or judicial action or proceeding is instituted (or threatened to
be instituted)  challenging  any  transaction  contemplated by this Agreement as
violative of any Antitrust Law, each of Acquiror and Target shall  cooperate and
use all reasonable  efforts  vigorously to contest and resist any such action or
proceeding  and to have vacated,  lifted,  reversed,  or overturned  any decree,
judgment, injunction or other order, whether temporary, preliminary or permanent
(each an "Order"), that is in effect and that prohibits,  prevents, or restricts
consummation  of the  Merger or any such  other  transactions,  unless by mutual
agreement  Acquiror and Target decide that litigation is not in their respective
best  interests.  Notwithstanding  the provisions of the  immediately  preceding
sentence,  it is expressly  understood  and agreed that  Acquiror  shall have no
obligation  to  litigate  or contest any  administrative  or judicial  action or
proceeding  or any Order beyond the earlier of (i) March 31,  1998,  or (ii) the
date of a  ruling  preliminarily  enjoining  the  Merger  issued  by a court  of
competent  jurisdiction.  Each of Acquiror and Target  shall use all  reasonable
efforts to take such action as may be required  to cause the  expiration  of the
notice  periods  under  the HSR or other  Antitrust  Laws with  respect  to such
transactions as promptly as possible after the execution of this Agreement.  

     (c)  Notwithstanding  the foregoing,  neither  Acquiror nor Target shall be
required to agree to divest itself of or hold separate any subsidiary,  division
or  business  unit  that is  material  to the  business  of such  party  and its
subsidiaries,  taken as a whole, or the divestiture or holding separate of which
would  be  reasonably  likely  to  have a  Material  Adverse  Effect  on (A) the
business,  properties,  assets,  liabilities,  financial condition or results of
operations  of such  party  and its  subsidiaries,  taken  as a whole or (B) the
benefits intended to be derived as a result of the Merger.

     5.8 Pooling Accounting. Acquiror and Target shall each use its best efforts
to cause the business  combination  to be effected by the Merger to be accounted
for as a  pooling  of  interests  and to take such  action as may be  reasonably
necessary  to permit such  treatment.  Each of Acquiror and Target shall use its
best  efforts (i) to cause its  respective  "Affiliates"  (as defined in Section
5.10) not to take any action that would adversely affect the ability of Acquiror
to  account  for the  business  combination  to be  effected  by the Merger as a
pooling   of   interests   and  (ii)  to  cause   Deloitte   &  Touche  LLP  and
PricewaterhouseCoopers LLP to deliver the letters referred to in Sections 6.1(g)
and 6.1(h) of this Agreement.

     5.9 Update Disclosure;  Breaches. From and after the date of this Agreement
until the  Effective  Time,  each party hereto shall  promptly  notify the other
party,  by written  update to its  Disclosure  Letter,  of (i) the occurrence or
non-occurrence  of any event that would be likely to cause any  condition to the
obligations  of any  party to  effect  the  Merger  and the  other  transactions
contemplated  by this  Agreement  not to be  satisfied,  or (ii) the  failure of
Target or Acquiror,  as the case may be, to comply with or satisfy any covenant,
condition or  agreement to be complied  with or satisfied by it pursuant to this
Agreement that would be likely to result in any condition to the  obligations of
any party to effect the Merger and the other  transactions  contemplated by this
Agreement  not to be  satisfied.  The  delivery  of any notice  pursuant to this
Section  5.9  shall  not cure  any  breach  of any  representation  or  warranty
requiring  disclosure  of such  matter  prior to the date of this  Agreement  or
otherwise  limit  or  affect  the  remedies  available  hereunder  to the  party
receiving such notice.

     5.10 Stockholder Agreements. Upon the execution of this Agreement, Acquiror
and Target  will  provide  each other with a list of those  persons  who are, in
Acquiror's or Target's respective reasonable judgment,  "affiliates" of Acquiror
or Target, respectively, within the meaning of Rule 145 under the Securities Act
("Rule  145").  Each such  person who is an  "affiliate"  of  Acquiror or Target
within the meaning of Rule 145 is referred to herein as an "Affiliate." Acquiror
and Target shall provide each other such  information and documents as Target or
Acquiror shall reasonably  request for purposes of reviewing such list and shall
notify the other party in writing  regarding  any change in the  identity of its
Affiliates  prior to the  Closing  Date.  Target  shall use its best  efforts to
deliver to Acquiror by the date of execution of this Agreement (and in each case
by the  Effective  Time),  from each of the  Affiliates  of Target,  an executed
agreement,  in the form  attached  hereto  as  Exhibit  D-1  ("Target  Affiliate
Agreement").  Acquiror  shall use its best  efforts  to deliver to Target by the
date of execution of this  Agreement  (and in each case by the Effective  Time),
from each of the  Affiliates  of Acquiror,  an executed  agreement,  in the form
attached hereto as Exhibit D-2 ("Acquiror Affiliate Agreement").  Acquiror shall
be entitled to place  appropriate  legends on the  certificates  evidencing  any
Acquiror  Common Stock to be received by  Affiliates  of Target  pursuant to the
terms of this Agreement,  and to issue appropriate stop transfer instructions to
the transfer agent for the Acquiror  Common Stock,  consistent with the terms of
the Target Affiliate Agreement.

     5.11 Indemnification.

     (a)  From  and  after  the  Effective  Time,  Acquiror  and  the  Surviving
Corporation jointly and severally shall indemnify, defend and hold harmless each
person who is now,  or has been at any time prior to the date of this  Agreement
or who becomes prior to the Effective Time, an officer,  director or employee of
Target or any of its subsidiaries (the "Indemnified Parties") in respect of acts
or omissions  occurring on or prior to the Effective Time to the extent provided
under Target's  Certificate of  Incorporation,  Bylaws (as in effect on the date
hereof)  and  indemnification  agreements  in  effect as of the  Effective  Time
(provided,   however,  that  Target  covenants  that  it  will  not  enter  into
indemnification agreements or modify existing indemnification agreements between
the date of this Agreement and the Effective Time, except as required by law and
except  that   officers   and   directors  of  Target  may  execute  a  form  of
indemnification  agreement  in the form  previously  provided to Acquiror or its
counsel);  provided that such indemnification shall be subject to any limitation
imposed from time to time under applicable law.

     (b) For a period of six years after the Effective Time, Acquiror will cause
the Surviving Corporation to use its commercially reasonable efforts to maintain
in effect, if available,  directors' and officers'  liability insurance covering
those persons who are  currently  covered by Target's  directors'  and officers'
liability insurance policy on terms substantially similar to those applicable to
the current  directors  and officers of Target;  provided,  however,  that in no
event will Acquiror or the Surviving Corporation be required to expend in excess
of $180,000 in the aggregate  (i.e.,  for six years  coverage) for such coverage
(or such coverage as is available for such $180,000).

     5.12 Irrevocable  Proxies.  Target shall use its best efforts, on behalf of
Acquiror and pursuant to the request of Acquiror,  to cause affiliates of Target
who are officers and directors to execute and deliver to Acquiror,  a Voting and
Proxy Agreement in the form of Exhibit C attached hereto  concurrently  with the
execution of this Agreement.

     5.13 Legal Requirements.  Each of Acquiror, Merger Sub and Target will, and
will  cause  their  respective  subsidiaries  to,  take all  reasonable  actions
necessary to comply promptly with all legal  requirements that may be imposed on
them with respect to the consummation of the  transactions  contemplated by this
Agreement and will promptly cooperate with and furnish  information to any party
hereto  necessary in  connection  with any such  requirements  imposed upon such
other party in connection with the consummation of the transactions contemplated
by this Agreement and will take all reasonable  actions necessary to obtain (and
will  cooperate  with the  other  parties  hereto  in  obtaining)  any  consent,
approval, order or authorization of, or any registration,  declaration or filing
with, any Governmental  Entity or other person,  required to be obtained or made
in connection with the taking of any action contemplated by this Agreement.

     5.14 Tax-Free Reorganization. Neither Target, Acquiror nor Merger Sub will,
either before or after consummation of the Merger,  take any action that, to the
knowledge  of such  party,  would  cause  the  Merger  to fail to  constitute  a
"reorganization" within the meaning of Code Section 368.

     5.15 Stock Options.

     (a) At  the  Effective  Time,  the  Target  Stock  Option  Plans  and  each
outstanding  option to purchase  shares of Target  Common Stock under the Target
Stock Option Plans,  whether  vested or unvested,  shall be assumed by Acquiror,
and Target Company's repurchase right with respect to any unvested option shares
granted  under the Target  Stock  Option  Plans shall be  assigned to  Acquiror.
Target has  delivered to Acquiror a schedule (the "Option  Schedule")  that sets
forth  a true  and  complete  list  as of the  date  hereof  of all  holders  of
outstanding options under the Target Stock Option Plans, including the number of
shares of Target  Capital  Stock  subject to each such  option,  the exercise or
vesting schedule, the exercise price per share and the term of each such option.
On the Closing Date, Target shall deliver to Acquiror an updated Option Schedule
current as of such date.  Each such  option so  assumed by  Acquiror  under this
Agreement  shall  continue  to have,  and be  subject  to,  the same  terms  and
conditions set forth in the Target Stock Option Plans  immediately  prior to the
Effective Time, except that (i) such option shall be exercisable for that number
of whole  shares of Acquiror  Common Stock equal to the product of the number of
shares of Target  Common Stock that were  issuable  upon exercise of such option
immediately  prior to the Effective Time multiplied by the Exchange  Ratio,  and
rounded down to the nearest whole number of shares of Acquiror Common Stock, and
(ii) the per share  exercise  price  for the  shares of  Acquiror  Common  Stock
issuable  upon  exercise of such  assumed  option shall be equal to the quotient
determined  by dividing the exercise  price per share of Target  Common Stock at
which such option was  exercisable  immediately  prior to the Effective Time, by
the Exchange Ratio, rounded up to the nearest whole cent. The options so assumed
by Acquiror  shall  qualify  following  the  Effective  Time as incentive  stock
options  as  defined  in  Section  422 of the Code to the  extent  such  options
qualified as incentive  stock options prior to the  Effective  Time.  Within ten
(10) business days after the Effective Time,  Acquiror will issue to each person
who,  immediately  prior to the  Effective  Time was a holder of an  outstanding
option  under the Target Stock Option  Plans,  a document in form and  substance
satisfactory  to Target  evidencing  the foregoing  assumption of such option by
Acquiror.

     (b) Acquiror shall take all corporate  action necessary to reserve and make
available  for issuance a sufficient  number of shares of Acquiror  Common Stock
for delivery under Target Stock Options  assumed in accordance with this Section
5.15. Within five business days after the Effective Time,  Acquiror shall file a
registration statement on Form S-8 (or any successor or other appropriate forms)
with respect to the shares of Acquiror  Common Stock subject to such options and
shall  use  its  reasonable  efforts  to  maintain  the  effectiveness  of  such
registration  statement or  registration  statements  (and  maintain the current
status of the prospectus or prospectuses  contained therein) for so long as such
options remain outstanding.

     (c)  Outstanding  purchase  rights under the Target ESPP shall be exercised
upon the earlier of (i) the next  scheduled  purchase date under the Target ESPP
or (ii)  immediately  prior to the Effective  Time, and each  participant in the
Target ESPP shall  accordingly be issued shares of Target Common Stock according
to the terms of the  Target  ESPP at that time  which  shall be  converted  into
shares of Acquiror  Common Stock in the Merger.  The Target ESPP shall terminate
with such exercise date, and no purchase rights shall be subsequently granted or
exercised  under the Target  ESPP.  Target  employees  who meet the  eligibility
requirements for participation in the Aquiror Employee Stock Purchase Plan shall
begin payroll deductions under that plan as of the first date on which the terms
of the Acquiror ESPP allows such individuals to commence participation.

     5.16 Listing of Additional  Shares.  Prior to the Effective Time,  Acquiror
shall file with Nasdaq a Notification Form for Listing of Additional Shares with
respect to the shares referred to in Section 6.1(e) below.

     5.17 Additional Agreements;  Reasonable Efforts. Upon the terms and subject
to the conditions set forth in this Agreement, each of the parties agrees to use
all reasonable  efforts to take, or cause to be taken,  all action and to do, or
cause to be done, all things  necessary,  proper or advisable  under  applicable
laws  and  regulations  to  consummate  and  make  effective  the   transactions
contemplated by this Agreement,  subject to the appropriate vote of stockholders
of Target described in Section 5.3,  including  cooperating fully with the other
party,  including  by provision  of  information.  In case at any time after the
Effective  Time any further  action is  necessary  or desirable to carry out the
purposes of this Agreement or to vest the Surviving  Corporation with full title
to all  properties,  assets,  rights,  approvals,  immunities  and franchises of
either of the  constituent  corporations,  the proper  officers and directors of
each party to this Agreement shall take all such necessary action.

     5.18 Employee Benefits. Acquiror shall take such reasonable actions, to the
extent  permitted by  Acquiror's  benefits  program,  as are  necessary to allow
eligible employees of Target to participate in the benefit programs of Acquiror,
or alternative  benefits programs in the aggregate  substantially  comparable to
those  applicable  to  employees  of  Acquiror  on  similar  terms,  as  soon as
practicable  after the Effective Time of the Merger.  To the extent permitted by
Acquiror's  benefit  plans,  from and after the Effective  Time,  Acquiror shall
grant all  employees  of Target  credit for all  service  (to the same extent as
service with  Acquiror is taken into account with respect to similarly  situated
employees  of  Acquiror)  with  Target  prior  to the  Effective  Time  for  (i)
eligibility and vesting purposes and (ii) for purposes of vacation accrual after
the  Effective  Time as if such service  with Target was service with  Acquiror.
Acquiror and Target agree that where  applicable  with respect to any medical or
dental benefit plan of Acquiror,  Acquiror shall, to the extent  permitted under
its plans,  waive any  pre-existing  condition  exclusion  and  actively-at-work
requirements  (provided,   however,  that  no  such  waiver  shall  apply  to  a
pre-existing  condition of any  employee of Target who was, as of the  Effective
Time,  excluded  from  participation  in a plan by virtue  of such  pre-existing
condition).

     5.19 Pooling Letters.

     (a) Target  shall use all  reasonable  effects to cause to be  delivered to
Acquiror a letter of Deloitte & Touche LLP, Target's independent auditors, dated
a date within two business days before the date of this  Agreement to the effect
that the Merger  qualifies  for  pooling of  interest  accounting  treatment  if
consummated  in  accordance  with  this  Agreement  and  in  a  form  reasonably
satisfactory  to  Acquiror  and  customary  in scope and  substance  for letters
delivered by independent  public  accountants in connection with transactions of
this type.

     (b) Acquiror shall use all  reasonable  effects to cause to be delivered to
Target a letter of PricewaterhouseCoopers  LLP, Acquiror's independent auditors,
dated a date within two business  days before the date of this  Agreement to the
effect that the Merger qualifies for pooling of interest accounting treatment if
consummated  in  accordance  with  this  Agreement  and  in  a  form  reasonably
satisfactory  to  Target  and  customary  in scope  and  substance  for  letters
delivered by independent  public  accountants in connection with transactions of
this type.

     5.20 No Rights Plan Amendment.  Except as required by Section 6.3(i), prior
to the Closing,  Target shall not amend or modify the Target  Rights Plan in any
manner or take  another  action  so as to (i)  render  the  Target  Rights  Plan
inapplicable to any transaction(s)  other than the Merger and other transactions
contemplated by this Agreement, the Stock Option Agreement, the Target Affiliate
Agreements  and the Voting  Agreements,  or (ii)  permit any person or group who
would  otherwise be an Acquiring  Person (as defined in the Target  Rights Plan)
not to be an Acquiring  Person,  or (iii)  provide that a  Distribution  Date, a
Section 11(a)(ii)  Trigger Date or a Shares  Acquisition Date (as such terms are
defined in the Target  Rights Plan) or similar event does not occur by reason of
the execution of any agreement or transaction  other than this Agreement and the
Merger and the agreements and transactions  contemplated  hereby and thereby, or
(iv) except as specifically contemplated by this Agreement, otherwise affect the
rights of holders of Target Rights.  Notwithstanding the foregoing,  at any time
after the earlier of (i) January 15, 1999,  or (ii) ten days after the effective
date of the Registration  Statement, in connection with a Qualified Tender Offer
(as  hereafter  defined)  Target  shall be entitled to take any action under the
Targets'  Rights  Plan it so  determines  to  permit a  Qualified  Tender  Offer
(including a delay of any Distribution Date), provided that no such action shall
violate  the  Merger  Permissive  Amendment  (as  defined in  Section  2.25).  A
"Qualified  Tender Offer" shall be an all cash tender offer for all  outstanding
shares of Target  Common  Stock,  which  tender  offer  qualifies  as a Superior
Proposal,  is fully  financed (or in the  reasonable  determination  of Target's
Board of Directors and financial advisors is capable of being financed),  is not
otherwise  subject to  non-customary,  material  conditions  and would not close
prior to the earlier of a negative  Target  stockholders'  vote on the Merger or
the termination of this Agreement.



                                   ARTICLE VI

                            CONDITIONS TO THE MERGER

     6.1  Conditions  to  Obligations  of Each Party to Effect the  Merger.  The
respective  obligations of each party to this Agreement to consummate and effect
this Agreement and the transactions  contemplated hereby shall be subject to the
satisfaction  at or  prior  to the  Effective  Time  of  each  of the  following
conditions,  any of which may be waived,  in writing,  by  agreement  of all the
parties hereto:

     (a)  Stockholder  Approval.  This  Agreement and the Merger shall have been
approved  and  adopted by the  holders  of at least a majority  of the shares of
Target  Common  Stock  outstanding  as of the  record  date  set for the  Target
Stockholders Meeting.

     (b) No  Injunctions  or Restraints;  Illegality.  No temporary  restraining
order, preliminary or permanent injunction or other order issued by any court of
competent  jurisdiction  or other legal or regulatory  restraint or  prohibition
preventing  the  consummation  of the Merger  shall be in effect,  nor shall any
proceeding   brought  by  an  administrative   agency  or  commission  or  other
governmental authority or instrumentality,  domestic or foreign,  seeking any of
the foregoing be pending;  nor shall there be any action taken,  or any statute,
rule, regulation or order enacted, entered, enforced or deemed applicable to the
Merger,  which makes the  consummation  of the Merger  illegal.  In the event an
injunction  or other order shall have been issued,  each party agrees to use its
reasonable efforts to have such injunction or other order lifted.

     (c) Registration Statement Effective;  Proxy Statement.  The SEC shall have
declared the  Registration  Statement  effective.  No stop order  suspending the
effectiveness of the Registration  Statement or any part thereof shall have been
issued and no proceeding for that purpose,  and no similar proceeding in respect
of the Proxy  Statement/Prospectus,  shall have been  initiated or threatened in
writing by the SEC.

     (d)  Governmental  Approval.  Acquiror  and  Target  and  their  respective
subsidiaries  shall  have  timely  obtained  from each  Governmental  Entity all
approvals,  waivers and consents,  if any,  necessary for  consummation of or in
connection  with the Merger and the several  transactions  contemplated  hereby,
including  such  approvals,  waivers and  consents as may be required  under the
Securities Act, under state Blue Sky laws, and under HSR.

     (e) Tax Opinion.  Each of Target and Acquiror shall have received a written
opinion  from  their  respective  counsel to the  effect  that the  Merger  will
constitute a reorganization within the meaning of Section 368 of the Code, which
opinions shall be substantially  identical in substance. In preparing the Target
and the Acquiror tax opinions,  counsel may rely on reasonable  assumptions  and
may  also  rely on (and to the  extent  reasonably  required,  the  parties  and
Target's stockholders shall make) reasonable representations related thereto.

     (f)  Listing of  Additional  Shares.  The filing  with the Nasdaq  National
Market of a Notification  Form for Listing of Additional  Shares with respect to
the shares of Acquiror  Common  Stock  issuable  upon  conversion  of the Target
Common  Stock in the Merger and upon  exercise of the  options  under the Target
Stock Option Plans assumed by Acquiror shall have been made.

     (g) Pooling Letter from Target's Accountants.  Acquiror shall have received
a letter from Deloitte & Touche LLP,  dated as of the Closing Date and addressed
to Acquiror, Target and  PricewaterhouseCoopers  LLP, reasonably satisfactory in
form and  substance  to Acquiror and  PricewaterhouseCoopers  LLP, to the effect
that, after reasonable investigation, Deloitte & Touche LLP are not aware of any
fact concerning Target or any of Target's  stockholders or Affiliates that could
preclude  Acquiror from accounting for the Merger as a "pooling of interests" in
accordance with generally accepted accounting principles,  Accounting Principles
Board Opinion No. 16 and all published  rules,  regulations  and policies of the
SEC.

     (h)  Pooling  Letter  from  Acquiror's  Accountants.  Acquiror  shall  have
received a letter from PricewaterhouseCoopers LLP, dated as of the Closing Date,
reasonably  satisfactory  in form and substance to Acquiror,  to the effect that
Acquiror may account for the Merger as a "pooling of  interests"  in  accordance
with generally  accepted  accounting  principles,  Accounting  Principles  Board
Opinion No. 16 and all published rules, regulations and policies of the SEC.

     6.2  Additional  Conditions to Obligations  of Target.  The  obligations of
Target to consummate and effect this Agreement and the transactions contemplated
hereby shall be subject to the satisfaction at or prior to the Effective Time of
each of the following  conditions,  any of which may be waived,  in writing,  by
Target:

     (a)  Representations  and Warranties.  Each  representation and warranty of
Acquiror and Merger Sub contained in this Agreement (i) shall have been true and
correct as of the date of this  Agreement  and (ii) shall be true and correct on
and as of the  Closing  Date with the same  force  and  effect as if made on the
Closing  Date  except,  (A) in each  case,  or in the  aggregate,  as  does  not
constitute  a Material  Adverse  Effect on Acquiror  and Merger Sub,  taken as a
whole,  (B) for  changes  contemplated  by  this  Agreement  and  (C) for  those
representations and warranties that address matters only as of a particular date
(which  representations  shall  have  been true and  correct  except as does not
constitute  a Material  Adverse  Effect on Acquiror  and Merger Sub,  taken as a
whole, as of such particular  date) (it being  understood  that, for purposes of
determining  the  accuracy  of  such  representations  and  warranties,  (i) all
"Material Adverse Effect"  qualifications and other  qualifications based on the
word  "material"  or  similar  phrases  contained  in such  representations  and
warranties  shall be disregarded  and (ii) any update of or  modification to the
Acquiror Disclosure Letter made or purported to have been made after the date of
this Agreement shall be  disregarded).  Target shall have received a certificate
with  respect to the  foregoing  signed on behalf of Acquiror  by an  authorized
officer of Acquiror.

     (b) Agreements and Covenants.  Acquiror and Merger Sub shall have performed
or complied in all material respects with all agreements and covenants  required
by this  Agreement to be  performed or complied  with by them on or prior to the
Closing Date, and Target shall have received a certificate to such effect signed
on behalf of Acquiror by an authorized officer of Acquiror.

(c) No Material
Adverse  Changes.  There shall not have occurred any Material  Adverse Effect on
Acquiror  since the date of this  Agreement.  (d) Affiliate  Agreements.  Target
shall have  received  from the  Affiliates  of Acquiror  an  executed  Affiliate
Agreement  in  substantially  the form  attached  hereto  as  Exhibit  D-2.  

     6.3  Additional Conditions to the Obligations of Acquiror.  The obligations
of  Acquiror  and Merger Sub to  consummate  and effect this  Agreement  and the
transactions  contemplated  hereby  shall be subject to the  satisfaction  at or
prior to the Effective  Time of each of the following  conditions,  any of which
may be waived, in writing, by Acquiror:

     (a)  Representations  and Warranties.  Each  representation and warranty of
Target  contained in this  Agreement  (i) shall have been true and correct as of
the date of this  Agreement  and (ii) shall be true and correct on and as of the
Closing  Date with the same force and effect as if made on and as of the Closing
Date except (A) in each case,  or in the  aggregate,  as does not  constitute  a
Material  Adverse  Effect  on  Target,  (B)  for  changes  contemplated  by this
Agreement and (C) for those  representations and warranties that address matters
only as of a  particular  date (which  representations  shall have been true and
correct except as does not constitute a Material  Adverse Effect on Target as of
such particular date) (it being understood that, for purposes of determining the
accuracy of such  representations  and  warranties,  (i) all  "Material  Adverse
Effect"  qualifications and other qualifications based on the word "material" or
similar  phrases  contained  in such  representations  and  warranties  shall be
disregarded  and (ii) any update of or  modification  to the  Target  Disclosure
Letter  made or  purported  to have been made  after the date of this  Agreement
shall be  disregarded).  Acquiror shall have received a certificate with respect
to the foregoing signed on behalf of Target by an authorized officer of Target.

     (b) Agreements  and  Covenants.  Target shall have performed or complied in
all  material  respects  with all  agreements  and  covenants  required  by this
Agreement  to be  performed  or  complied  with by it at or prior to the Closing
Date,  and Acquiror  shall have received a certificate  to such effect signed on
behalf of Target by the Chief Executive  Officer and the Chief Financial Officer
of Target.

     (c) Third Party Consents.  Acquiror shall have been furnished with evidence
satisfactory  to it of the consent or approval of those persons whose consent or
approval shall be required in connection  with the Merger under the contracts of
Target set forth on Schedule 6.3(c) hereto.

     (d) No Material Adverse Changes. There shall not have occurred any Material
Adverse Effect on Target since the date of this Agreement.

     (e) Affiliate Agreements.  Acquiror shall have received from the Affiliates
of Target an executed  Affiliate  Agreement in  substantially  the form attached
hereto as Exhibit D-1.

     (f)  Employment  Agreements.  Each of the  employees of Target set forth on
Schedule  6.3(f)  shall have entered  into an  Employment  Agreement in the form
attached hereto as Exhibit E.

     (g)  Separation  Agreements.  Each of the  employees of Target set forth on
Schedule  6.3(g)  shall have  entered  into a  Separation  Agreement in the form
attached hereto as Exhibit F.

     (h)  Termination  of Target 401(k) Plan.  If requested by Acquiror,  Target
shall have  terminated  its 401(k) Plan.  (i) Target  Rights  Plan.  All actions
necessary  to  extinguish  and cancel all  outstanding  Rights  under the Target
Rights  Plan or render such rights  inapplicable  to the Merger  shall have been
taken.

                                   ARTICLE VII


                   TERMINATION, EXPENSES, AMENDMENT AND WAIVER

     7.1 . This  Agreement  may be terminated at any time prior to the Effective
Time (with respect to Sections 7.1(b) through  7.1(f),  by written notice by the
terminating  party to the other party),  whether before or after approval of the
matters presented in connection with the Merger by the stockholders of Target:

     (a) by mutual written consent of Target and Acquiror; or

     (b) by  either  Target  or  Acquiror  if the  Merger  shall  not have  been
consummated by March 31, 1999 (the "Outside  Date")  (provided that the right to
terminate this Agreement under this Section 7.1(b) shall not be available to any
party whose failure to fulfill any  obligation  under this  Agreement has been a
significant  cause of or  resulted  in the  failure of the Merger to occur on or
before such date); or

     (c) by either  Target or Acquiror if a court of competent  jurisdiction  or
other Governmental  Entity shall have issued a nonappealable final order, decree
or ruling or taken any other nonappealable final action, in each case having the
effect of  permanently  restraining,  enjoining  or  otherwise  prohibiting  the
Merger; or

     (d) by either Acquiror or Target,  if at the Target  Stockholders'  Meeting
(including any adjournment or postponement  thereof),  the requisite vote of the
stockholders  of Target in favor of this Agreement and the Merger shall not have
been obtained  (provided that the right to terminate  this Agreement  under this
Section  7.1(d)  shall not be  available  to Target  where the failure to obtain
Target  Stockholder  Approval shall have been caused by the action or failure to
act of Target and such action or failure to act constitutes a material breach by
Target of this  Agreement).  A material breach by a party of Sections 5.2 or 5.3
hereof will constitute a material breach hereunder; or

     (e) by  Acquiror,  if (i) the  Board of  Directors  of  Target  shall  have
withdrawn  or modified its  unanimous  recommendation  of this  Agreement or the
Merger (it being  understood  that Louis Cole, a director of Target,  shall have
abstained  from voting on such  matter);  (ii) the Board of  Directors of Target
fails to reaffirm its unanimous  recommendation  of this Agreement or the Merger
(except that Louis Cole, a director of Target,  shall have abstained from voting
on such  matters)  within ten (10)  business  days after  Acquiror  requests  in
writing that such unanimous  recommendation  be reaffirmed at any time following
the public announcement of an Acquisition Proposal; (iii) the Board of Directors
of Target shall have  recommended to the  stockholders  of Target an Alternative
Transaction;  (iv) a  tender  offer  or  exchange  offer  for 15% or more of the
outstanding  shares of Target Common Stock is commenced  (other than by Acquiror
or an Affiliate of Acquiror) and the Board of Directors of Target shall not have
sent to its security  holders  pursuant to Rule 14e-2  within ten (10)  business
days after such tender or exchange  offer is first  published,  sent or given, a
statement disclosing that Target recommends rejection of such tender or exchange
offer; or (v) Target fails to call and hold the Target Stockholders'  Meeting by
the date immediately  preceding the Outside Date and such failure  constitutes a
material breach by Target of Section 5.2 or 5.3 hereof.

     (f)  by   Target  or   Acquiror,   if  there  has  been  a  breach  of  any
representation,  warranty,  covenant or agreement on the part of the other party
set forth in this Agreement, which breach (i) causes the conditions set forth in
Section  6.3(a) or (b) (in the case of termination by Acquiror) or 6.2(a) or (b)
(in the case of termination  by Target) not to be satisfied,  and (ii) shall not
have been cured within  twenty (20) business days (or prior to the Outside Date,
if earlier)  following  receipt by the breaching party of written notice of such
breach from the other party.

     7.2 Effect of Termination. In the event of termination of this Agreement as
provided in Section 7.1, this Agreement  shall  forthwith  become void and there
shall be no liability or  obligation  on the part of Acquiror or Target or their
respective officers, directors,  stockholders or affiliates, except as otherwise
set forth in Section 7.3 and except to the extent that such termination  results
from the breach by a party hereto of any of its  representations,  warranties or
covenants set forth in this Agreement;  provided that, the provisions of Section
5.5  (Confidentiality),  Section 7.3  (Expenses and  Termination  Fees) and this
Section 7.2 shall remain in full force and effect and survive any termination of
this Agreement.

     7.3 Expenses and Termination Fees

     (a) Except as set forth in this Section 7.3, all fees and expenses incurred
in connection with this Agreement and the transactions contemplated hereby shall
be paid by the party  incurring  such  expenses,  whether  or not the  Merger is
consummated; provided, however, that Acquiror and Target shall share equally all
fees and  expenses,  other than  attorneys'  fees,  incurred  in relation to the
printing and filing of the Proxy  Statement  (including any related  preliminary
materials) and the Registration  Statement  (including  financial statements and
exhibits) and any amendments or supplements.

     (b)  Target  shall  pay  Acquiror  a  termination   fee  of  $2,000,000  in
immediately  available  funds within one business day after the  termination  of
this Agreement by Acquiror pursuant to Section 7.1(e).

     (c) As used in this Agreement, "Alternative Transaction" means either (i) a
transaction  pursuant  to which any  person  (or group of  persons)  other  than
Acquiror or its respective affiliates (a "Third Party"),  acquires more than 15%
of the  outstanding  shares of Target Common Stock, as the case may be, pursuant
to a  tender  offer  or  exchange  offer or  otherwise,  (ii) a merger  or other
business combination involving Target pursuant to which any Third Party acquires
more than 15% of the  outstanding  equity  securities  of  Target or the  entity
surviving  such  merger or  business  combination,  (iii) any other  transaction
pursuant to which any Third Party acquires control of assets (including for this
purpose the outstanding  equity  securities of  subsidiaries of Target,  and the
entity  surviving any merger or business  combination  including any of them) of
Target  having a fair market value (as  determined  by the Board of Directors of
Target or Acquiror, as the case may be, in good faith) equal to more than 15% of
the fair market value of all the assets of Target and its subsidiaries, taken as
a whole, immediately prior to such transaction,  or (iv) any public announcement
by a Third Party of a proposal,  plan or intention to do any of the foregoing or
any agreement to engage in any of the foregoing.

     7.4 . The  boards  of  directors  of the  parties  hereto  may  cause  this
Agreement  to be amended at any time by execution  of an  instrument  in writing
signed on behalf of each of the parties hereto;  provided that an amendment made
subsequent to adoption of the Agreement by the  stockholders of Target shall not
(i) alter or  change  the  amount or kind of  consideration  to be  received  on
conversion  of the Target  Capital  Stock,  (ii) alter or change any term of the
Certificate of Incorporation of the Surviving  Corporation to be effected by the
Merger,  or  (iii)  alter or  change  any of the  terms  and  conditions  of the
Agreement if such  alteration  or change would  adversely  affect the holders of
Target Capital Stock.

     7.5  Extension;  Waiver . At any time prior to the Effective Time any party
hereto  may,  to the  extent  legally  allowed,  (i)  extend  the  time  for the
performance of any of the obligations or other acts of the other parties hereto,
(ii) waive any inaccuracies in the  representations  and warranties made to such
party contained  herein or in any document  delivered  pursuant hereto and (iii)
waive  compliance  with any of the  agreements or conditions  for the benefit of
such party contained herein.  Any agreement on the part of a party hereto to any
such  extension or waiver shall be valid only if set forth in an  instrument  in
writing signed on behalf of such party.


                                  ARTICLE VIII


                               GENERAL PROVISIONS

     8.1 Notices.  All notices and other  communications  hereunder  shall be in
writing  and shall be deemed  given if  delivered  personally  or by  commercial
delivery  service,  or mailed by  registered or certified  mail (return  receipt
requested) or sent via facsimile  (with  confirmation of receipt) to the parties
at the  following  address  (or at such  other  address  for a party as shall be
specified by like notice):

(a)                             if to Acquiror or Merger Sub, to:

                                        Legato Systems, Inc.
                                        3210 Porter Drive
                                        Palo Alto, CA  94304
                                        Attention:  Louis C. Cole
                                        Facsimile No.: (650) 812-6032
                                        Telephone No.: (650) 812-6000

                                        with a copy to:

                                        Gunderson Dettmer Stough Villeneuve
                                        Franklin & Hachigian, LLP
                                        155 Constitution Drive
                                        Menlo Park, CA  94025
                                        Attention:  Robert V. Gunderson, Jr.
                                        Facsimile No.: (650) 321-2800
                                        Telephone No.: (650) 463-5200

(b)                             if to Target, to:

                                        Qualix Group, Inc.
                                        177 Bovet Road, Second Floor
                                        San Mateo Road, CA  94402
                                        Attention:  Richard G. Thau
                                        Facsimile No.: (650) 572-0200
                                        Telephone No.: (650) 572-1300

                                        with a copy to:

                                        Wilson Sonsini Goodrich & Rosati. P.C.
                                        650 Page Mill Road
                                        Palo Alto, CA  94303
                                        Attention:  Jeffrey D. Saper
                                        Facsimile No.: (650) 493-6811
                                        Telephone No.: (650) 493-9300

     8.2 Interpretation. When a reference is made in this Agreement to Exhibits,
such  reference  shall  be to an  Exhibit  to this  Agreement  unless  otherwise
indicated.  The words  "include,"  "includes" and  "including"  when used herein
shall be deemed in each case to be followed by the words  "without  limitation."
In this Agreement, any reference to any event, change, condition or effect being
"material"  with  respect to any entity or group of entities  means any material
event,  change,  condition  or effect  related to the  condition  (financial  or
otherwise),  properties,  assets  (including  intangible  assets),  liabilities,
business,  operations  or  results  of  operations  of such  entity  or group of
entities.  In this Agreement,  any reference to a "Material Adverse Effect" with
respect to any entity or group of entities means any event, change, condition or
effect that is  materially  adverse to the condition  (financial or  otherwise),
properties,  assets  (including  intangible  assets),   liabilities,   business,
operations or results of operations of such entity and its  subsidiaries,  taken
as a whole;  provided,  however,  that the  following  shall not be considered a
"Material  Adverse  Effect":  (i)  changes,  events,  violations,  inaccuracies,
circumstances  and effects that are caused by  conditions  affecting  the United
States  economy  as a whole or  affecting  the  industry  in which  such  entity
completes  as  a  whole,  which  conditions  do  not  affect  such  entity  in a
disproportionate manner, (ii) a shortfall in revenues of such entity as a result
of delays or  cancellations  in customer  orders  (including any effects on such
entity's  operating  income which result directly from such revenue  shortfall),
which delays or  cancellations  result from the announcement and pendency of the
Merger,  or (iii) the loss of  employees  resulting  from the  announcement  and
pendency  of  the  Merger.  In  this  Agreement,  any  reference  to  a  party's
"knowledge"  means such party's actual  knowledge after due and diligent inquiry
of senior officers and directors of such party and its  subsidiaries  reasonably
believed  by  Target or  Acquiror,  as  applicable,  to have  knowledge  of such
matters.  The phrase  "made  available"  in this  Agreement  shall mean that the
information  referred to has been made  available  if  requested by the party to
whom such  information  is to be made  available.  The phrases "the date of this
Agreement",  "the date hereof", and terms of similar import,  unless the context
otherwise  requires,  shall be deemed to refer to October 25, 1998. The table of
contents and headings  contained in this  Agreement are for  reference  purposes
only and  shall not  affect in any way the  meaning  or  interpretation  of this
Agreement.

     8.3   Counterparts.   This  Agreement  may  be  executed  in  one  or  more
counterparts,  all of which shall be considered  one and the same  agreement and
shall become effective when one or more counterparts have been signed by each of
the parties and delivered to the other  parties,  it being  understood  that all
parties need not sign the same counterpart.

     8.4 Entire Agreement;  No Third Party  Beneficiaries.  This Agreement,  the
other  Transaction  Documents  and  the  documents  and  instruments  and  other
agreements  specifically  referred  to  herein  or  delivered  pursuant  hereto,
including the Exhibits,  the Schedules,  including the Target  Disclosure Letter
and the Acquiror Disclosure Letter (a) constitute the entire agreement among the
parties  with  respect to the  subject  matter  hereof and  supersede  all prior
agreements  and  understandings,  both written and oral,  among the parties with
respect to the subject matter hereof, except for the Confidentiality  Agreement,
which shall continue in full force and effect, and shall survive any termination
of this  Agreement or the Closing,  in  accordance  with its terms;  (b) are not
intended  to confer  upon any other  person  any rights or  remedies  hereunder,
except for the rights of the Target  Stockholders  and  optionholders to receive
the consideration set forth in Article I of this Agreement and the provisions of
Sections 5.11, 5.15 and 5.18.

     8.5 Severability. In the event that any provision of this Agreement, or the
application thereof, becomes or is declared by a court of competent jurisdiction
to be illegal,  void or  unenforceable,  the  remainder of this  Agreement  will
continue in full force and effect and the application of such provision to other
persons or  circumstances  will be  interpreted  so as  reasonably to effect the
intent of the parties hereto.  The parties further agree to replace such void or
unenforceable provision of this Agreement with a valid and enforceable provision
that will achieve,  to the extent  possible,  the  economic,  business and other
purposes of such void or unenforceable provision.

     8.6 Remedies  Cumulative.  Except as otherwise provided herein, any and all
remedies herein expressly  conferred upon a party will be deemed cumulative with
and not exclusive of any other remedy conferred hereby, or by law or equity upon
such party,  and the exercise by a party of any one remedy will not preclude the
exercise of any other remedy.

     8.7  Governing  Law. This  Agreement  shall be governed by and construed in
accordance  with the laws of the State of Delaware  without regard to applicable
principles of conflicts of law. Each of the parties hereto irrevocably  consents
to  the  exclusive  jurisdiction  of any  court  located  within  the  State  of
California,  in  connection  with any matter  based upon or arising  out of this
Agreement or the matters contemplated herein,  agrees that process may be served
upon them in any manner  authorized by the laws of the State of  California  for
such persons and waives and covenants not to assert or plead any objection  that
they might otherwise have to such jurisdiction and such process.

     8.8 Assignment.  Neither this Agreement nor any of the rights, interests or
obligations hereunder shall be assigned by any of the parties hereto (whether by
operation of law or otherwise)  without the prior  written  consent of the other
parties. Subject to the preceding sentence, this Agreement will be binding upon,
inure to the benefit of, and be enforceable by the parties and their  respective
successors and permitted assigns.

     8.9 Rules of  Construction.  The parties  hereto  agree that they have been
represented by counsel during the negotiation, preparation and execution of this
Agreement and, therefore, waive the application of any law, regulation,  holding
or rule of  construction  providing  that  ambiguities  in an agreement or other
document  will be  construed  against  the  party  drafting  such  agreement  or
document.



<PAGE>


             SIGNATURE PAGE TO AGREEMENT AND PLAN OF REORGANIZATION

     IN WITNESS  WHEREOF,  Target,  Acquiror  and Merger  Sub have  caused  this
Agreement to be executed and delivered by their  respective  officers  thereunto
duly authorized, all as of the date first written above.


                                   QUALIX GROUP, INC.



                                   By:    /s/ Richard G. Thau
                                          Richard G. Thau
                                          President and Chief Executive Officer


                                   LEGATO SYSTEMS, INC.



                                   By:    /s/ Louis C. Cole
                                          Louis C. Cole
                                          President and Chief Executive Officer



                                   HAT ACQUISITION CORP.



                                   By:   /s/ Louis C. Cole
                                         Louis C. Cole
                                         President and Chief Executive Officer


<PAGE>


                            SCHEDULE 6.3(c)--CONSENTS

None


<PAGE>


                                 SCHEDULE 6.3(f)
                    EMPLOYEES EXECUTING EMPLOYMENT AGREEMENTS


David R. Malmstedt
George Symons


<PAGE>


                                 SCHEDULE 6.3(g)
                    EMPLOYEES EXECUTING SEPARATION AGREEMENTS

Richard G. Thau



<PAGE>

                                                                    EXHIBIT 99.2

                           VOTING AND PROXY AGREEMENT



                  THIS  VOTING  AND PROXY  AGREEMENT  ("Agreement")  is made and
entered into as of October 25, 1998,  between Legato  Systems,  Inc., a Delaware
corporation ("Acquiror"), and the undersigned stockholder (the "Stockholder") of
Qualix Group, Inc., a Delaware corporation ("Company").

                                    RECITALS

                  A.   Concurrently   with  the  execution  of  this  Agreement,
Acquiror,  Company and HAT Acquisition Corp., a Delaware  corporation and wholly
owned subsidiary of Acquiror  ("Merger Sub"), have entered into an Agreement and
Plan of Reorganization,  dated October 25, 1998 (the "Merger Agreement"),  which
provides for the merger (the  "Merger") of Merger Sub with and into the Company,
and the cancellation of each outstanding share of the Company's common stock.

                  B. As a condition to its  willingness to enter into the Merger
Agreement,  Acquiror has requested that the Stockholder agree to certain matters
regarding  the  retention  and voting of the Shares (as  defined in Section  1.1
below) in connection with the Merger.

                  The parties agree as follows:

1.                Transfer of Shares.

1.1      Definitions.  For purposes of this Agreement:

     "Shares"  shall mean all issued and  outstanding  shares of Common Stock of
Company owned of record or beneficially  (over which  beneficially-owned  shares
the Stockholder exercises voting power) by the Stockholder as of the record date
for persons  entitled to (a) to receive notice of, and to vote at the meeting of
the  stockholders  of  Company  called  for the  purpose of voting on the matter
referred  to in  Section  2, or (b) to take  action by  written  consent  of the
stockholders of Company with respect to the matter referred to in Section 2.

     "Subject  Securities" shall mean: (i) all securities of Company  (including
all shares of Company Common Stock and all options, warrants and other rights to
acquire shares of Company Common Stock)  beneficially owned by Stockholder as of
the date of this  Agreement;  and  (ii) all  additional  securities  of  Company
(including  all  additional  shares of Company  Common Stock and all  additional
options, warrants and other rights to acquire shares of Company Common Stock) of
which  Stockholder  acquires  ownership  during the period from the date of this
Agreement  through the  Expiration  Date. As used herein,  the term  "Expiration
Date"  shall  mean the  earlier to occur of (i) such date and time as the Merger
shall become effective in accordance with the terms and provisions of the Merger
Agreement and (ii) the date on which the Merger Agreement shall be terminated in
accordance with Article 7 thereof.

     A person  shall be deemed to have  effected a  "Transfer"  of a security if
such person directly or indirectly:  (i) sells,  pledges,  encumbers,  grants an
option with respect to,  transfers or disposes of such  security or any interest
in such security;  or (ii) enters into an agreement or commitment  providing for
the sale of,  pledge of,  encumbrance  of,  grant of an option with  respect to,
transfer of or disposition of such security or any interest therein.

     "Opposing Proposal" shall mean (i) any proposal made in opposition to or in
competition  with  consummation of the Merger;  (ii) any merger,  consolidation,
sale of assets,  reorganization or  recapitalization,  with any party other than
with Acquiror and its affiliates;  or (iii) any liquidation or winding up of the
Company.

1.2  Additional  Purchases.  

     The Stockholder agrees that any shares of capital stock of the Company that
the Stockholder  shall purchase or with respect to which the  Stockholder  shall
otherwise acquire beneficial ownership after the execution of this Agreement and
prior to the  Expiration  Date ("New  Shares") shall be subject to the terms and
conditions of this Agreement to the same extent as if they constituted Shares.

1.3 Transferee of Subject Securities to be Bound by this Agreement.  

     Stockholder  agrees that, during the period from the date of this Agreement
through the Expiration Date,  Stockholder shall not cause or permit any Transfer
of any of the  Subject  Securities  to be effected  unless  such  Transfer is in
accordance  with  any  affiliate  agreement  between  Stockholder  and  Acquiror
contemplated by the Merger Agreement to which such Stockholder is bound and each
person to which any of such Subject  Securities,  or any interest in any of such
Subject  Securities,  is or  may be  transferred  shall  have:  (a)  executed  a
counterpart  of this  Voting  Agreement  and Proxy (with such  modifications  as
Acquiror may reasonably request); and (b) agreed in writing to hold such Subject
Securities (or interest in such Subject  Securities) subject to all of the terms
and provisions of this  Agreement.  2. Agreement to Vote Shares and Grant Proxy.
At every meeting of the  stockholders  of the Company called with respect to any
of the  following,  and on every  action or approval  by written  consent of the
stockholders  of  the  Company  with  respect  to  any  of  the  following,  the
Stockholder agrees to vote the Shares and any New Shares in favor of approval of
the Merger  Agreement  and the Merger and any matter  that could  reasonably  be
expected to facilitate the Merger.  In order to effectuate  the  foregoing,  the
Stockholder  does  hereby  constitute  and appoint  Acquiror,  or any nominee of
Acquiror,  with  full  power  of  substitution,  from  the  date  hereof  to the
Expiration  Date, as its true and lawful proxy,  for and in its name,  place and
stead,  including  the right to sign its name (as  stockholder)  to any consent,
certificate or other document relating to the Company that the laws of the State
of Delaware may permit or require,  to cause the Shares and any New Shares to be
voted in the manner  contemplated  by this  Section 2. The  parties  and proxies
named above shall not exercise this proxy on any other matter except as provided
above.  The parties  acknowledge that the proxy provided for here is irrevocable
and coupled with an interest.  This provision  shall not in any manner limit the
Company's  ability  through  its  officers  and  directors,   including  without
limitation,  the Stockholder,  to take action  consistent with the provisions of
Section 5.1 and Section 5.2 of the Merger Agreement.

3. Representations, Warranties and Covenants of the Stockholder. 

     The Stockholder represents,  warrants and covenants to Acquiror as follows:

3.1  Ownership of Shares.  

     The Stockholder  (together with such  Stockholder's  spouse, if applicable)
(i) is the sole  beneficial and record owner and holder of the Shares,  which at
the date hereof and at all times up until the Expiration  Date, will be free and
clear of any liens,  claims,  options,  charges,  security interests,  equities,
options,   warrants,   rights  to  purchase   (including,   without  limitation,
restrictions  on rights of  disposition  other than those  imposed by applicable
securities laws),  third party rights of any nature or other  encumbrances,  and
(ii) does not own any  shares of  capital  stock of the  Company  other than the
Shares (excluding shares as to which Stockholder  currently disclaims beneficial
ownership).

3.2 Authority;  Due Execution.  

     The Stockholder has full power and authority to make,  enter into and carry
out the terms of this Agreement. The Stockholder has duly executed and delivered
this  Agreement and (assuming the due  authorization,  execution and delivery of
this  Agreement  by Acquiror)  this  Agreement  constitutes  a valid and binding
obligation of the Stockholder.

3.3 No Proxy  Solicitations.

     The  Stockholder  will not,  and will not  permit  any  entity  under  such
Stockholder's  control to (i)  solicit  proxies or become a  "participant"  in a
"solicitation," as such terms are defined in Regulation 14A under the Securities
Exchange  Act of 1934,  as amended  (the  "Exchange  Act"),  with  respect to an
Opposing  Proposal;  (ii) initiate a stockholder's  vote or action by consent of
the Company stockholders with respect to an Opposing Proposal; or (iii) become a
member of a "group" (as such term is used in Section  13(d) of the Exchange Act)
with respect to any voting securities of the Company with respect to an Opposing
Proposal.  This  provision  shall not in any manner limit the Company's  ability
through  its  officers  and  directors,   including  without   limitation,   the
Stockholder,  to take action  consistent  with the provisions of Section 5.1 and
Section 5.2 of the Merger Agreement.

4.  Representations,  Warranties  and Covenants  of  Acquiror.  

     Acquiror represents, warrants and covenants to the Stockholder as follows:

4.1 Due  Authorization.  

     This Agreement has been authorized by all necessary corporate action on the
part of  Acquiror  and has been duly  executed by a duly  authorized  officer of
Acquiror.

4.2 Validity;  No Conflict.  

     This  Agreement  constitutes  the legal,  valid and binding  obligation  of
Acquiror.   Neither  the  execution  of  this  Agreement  by  Acquiror  nor  the
consummation of the transactions  contemplated hereby will result in a breach or
violation  of the terms of any  agreement  by which  Acquiror is bound or by any
decree,  judgment,  order, law or regulation now in effect of any court or other
governmental body applicable to Acquiror.  5. Termination.  This Agreement shall
terminate and shall have no further force or effect as of the Expiration Date.

6.   Miscellaneous.

6.1  Severability.  

     If any term,  provision,  covenant or restriction of this Agreement is held
by a court of competent jurisdiction to be invalid, void or unenforceable,  then
the  remainder of the terms,  provisions,  covenants  and  restrictions  of this
Agreement shall remain in full force and effect and shall in no way be affected,
impaired or invalidated.

6.2 Binding  Effect and  Assignment.  

     This Agreement and all of the  provisions  hereof shall be binding upon and
inure to the benefit of the parties hereto and their  respective  successors and
permitted  assigns,  but,  except as  otherwise  specifically  provided  herein,
neither this  Agreement nor any of the rights,  interests or  obligations of the
parties  hereto may be assigned by either of the parties  without  prior written
consent of the other.  This  Agreement  is  intended  to bind  Stockholder  as a
stockholder  of the Company only with respect to the specific  matters set forth
herein.

6.3  Amendments  and  Modification.  

     This Agreement may not be modified, amended, altered or supplemented except
upon the execution and delivery of a written  agreement  executed by the parties
hereto.

6.4 Specific Performance; Injunctive Relief. 

     The parties hereto acknowledge that Acquiror will be irreparably harmed and
that  there  will be no  adequate  remedy at law for a  violation  of any of the
covenants or agreements of the  Stockholder set forth herein.  Therefore,  it is
agreed that, in addition to any other remedies that may be available to Acquiror
upon any such violation, Acquiror shall have the right to enforce such covenants
and agreements by specific performance,  injunctive relief or by any other means
available to Acquiror at law or in equity.

6.5 Governing Law. 

     This Agreement  shall be governed by,  construed and enforced in accordance
with,  the  internal  laws of the State of  Delaware as such laws are applied to
contracts entered into and to be performed entirely within Delaware.  6.6 Entire
Agreement.  This Agreement  contains the entire  understanding of the parties in
respect of the subject matter hereof,  and supersedes all prior negotiations and
understandings between the parties with respect to such subject matter.

6.7   Counterparts.   

     This Agreement may be executed in several counterparts, each of which shall
be an original,  but all of which  together  shall  constitute  one and the same
agreement.  

6.8  Effect of Headings.

     The section  headings herein are for convenience  only and shall not affect
the construction or interpretation of this Agreement.

                           [Signature Page Follows.]


<PAGE>


                           VOTING AND PROXY AGREEMENT
                  IN WITNESS WHEREOF,  the parties have caused this Agreement to
be duly executed on the day and year first above written.


                         LEGATO SYSTEMS, INC.



                         By:____________________________________________________

                         Name:__________________________________________________

                         Title:_________________________________________________



                         STOCKHOLDER



                         By:____________________________________________________

                         Name of Stockholder:___________________________________

                         Name of Signatory  (if
                         different from name of
                         Stockholder):__________________________________________

                         Title of Signatory
                         (if applicable):_______________________________________




Number of shares beneficially owned by Stockholder subject to this Agreement:

Common Stock                                         ___________

<PAGE>
 
                                                                    EXHIBIT 99.3



                             STOCK OPTION AGREEMENT



                  THIS STOCK OPTION  AGREEMENT dated as of October 25, 1998 (the
"Agreement")  is entered  into by and between  Qualix  Group,  Inc.,  a Delaware
corporation   ("Target")  and  Legato  Systems,  Inc.,  a  Delaware  corporation
("ACQUIROR").  Capitalized  terms used in this  Agreement but not defined herein
shall have the meanings  ascribed  thereto in the Merger  Agreement  (as defined
below).

                                    Recitals

                  A.  Concurrently  with  the  execution  and  delivery  of this
Agreement,  Target,  ACQUIROR and Hat Acquisition Corp., a Delaware  corporation
and a  wholly  owned  subsidiary  of  ACQUIROR  ("Sub"),  are  entering  into an
Agreement and Plan of Reorganization  (the "Merger  Agreement"),  which provides
that, among other things,  upon the terms and subject to the conditions thereof,
Target and  ACQUIROR  will enter into a business  combination  transaction  (the
"Merger").

                  B. As a condition to ACQUIROR's  willingness to enter into the
Merger  Agreement,  ACQUIROR has requested that Target agree,  and Target has so
agreed,  to grant to  ACQUIROR an option to acquire  shares of  Target's  Common
Stock,  $0.001 par value, upon the terms and subject to the conditions set forth
herein.

                                    Agreement

                  NOW,  THEREFORE,  in consideration of the foregoing and of the
mutual covenants and agreements set forth herein and in the Merger Agreement and
for other good and valuable consideration, the receipt and adequacy of which are
hereby acknowledged, the parties hereto agree as follows:

1.   Grant of Option.

                  Target  hereby grants to ACQUIROR an  irrevocable  option (the
"Option")  to acquire up to a number of shares of the Common  Stock,  $0.001 par
value,  of Target  ("Target  Shares"),  including  the  associated  rights  (the
"Rights") to purchase  shares of Target  Preferred  Stock pursuant to the Rights
Agreement,   dated  as  of  July  31,  1997,   between  Target  and  ChaseMellon
Shareholders Services,  L.L.C., as Rights Agent (the "Rights Agreement"),  equal
to 19.9% of the issued and  outstanding  shares of capital stock of Target as of
the first date, if any, upon which an Exercise Event (as defined in Section 2(a)
below)  shall  occur (the  "Option  Shares"),  in the manner set forth  below by
paying cash at a price of $5.73 per share (the "Exercise Price"). All references
in this Agreement to Target Shares issued to ACQUIROR  hereunder shall be deemed
to include the Rights (subject to the terms of the Rights Agreement).

2.   Exercise of Option; Maximum Proceeds.

     (a) For all  purposes of this  Agreement,  an  "Exercise  Event" shall have
occurred upon  termination  of the Merger  Agreement  pursuant to Section 7.1(e)
thereof.

     (b) ACQUIROR may deliver to Target a written notice (an "Exercise  Notice")
specifying that it wishes to exercise and close a purchase of Option Shares upon
the  occurrence of an Exercise  Event and  specifying the total number of Option
Shares  it  wishes to  acquire  (i) upon  public  disclosure  of an  Acquisition
Proposal for an Alternative  Transaction with respect to Target,  with any party
other than ACQUIROR (or an affiliate of ACQUIROR), (ii) upon the commencement of
an election  contest  within the meaning of Rule 14a-11 of the Exchange Act with
the  purpose of  seeking  to effect a Change of  Control of the Target  Board of
Directors, or (iii) upon termination of the Merger Agreement pursuant to Section
7.1(e)  thereof  (the events  specified  in clauses  (i),  (ii) or (iii) of this
sentence  being  referred  to  herein as  "Conditional  Exercise  Events").  For
purposes  of this  Agreement,  a "Change  of  Control"  of the  Target  Board of
Directors  shall mean a change in the  composition  of such Board as a result of
which fewer than a majority of the incumbent  directors are directors who either
(A) had been  directors  of Target at least  eighteen  (18) months prior to such
change or (B) were  elected or  nominated  for election to the Target Board with
the  affirmative  votes of at least a  majority  of the  directors  who had been
directors of Target at least  eighteen  (18) months prior to such change and who
were still  serving as directors at the time of the election or  nomination.  At
any time after delivery of an Exercise  Notice,  unless such Exercise  Notice is
withdrawn by ACQUIROR,  the closing of a purchase of Option Shares (a "Closing")
specified in such Exercise  Notice shall take place at the principal  offices of
Target upon the  occurrence of an Exercise  Event or at such later date prior to
the  termination  of the Option as may be designated by ACQUIROR in writing.  In
the event that no Exercise Event shall occur prior to termination of the Option,
such Exercise Notice shall be void and of no further force and effect.

     (c) The Option shall terminate upon the earliest of (i) the Effective Time,
(ii) 12 months  following the  termination of the Merger  Agreement  pursuant to
Section 7.1(e) thereof,  or (iii) upon  termination of the Merger  Agreement for
any reason other than pursuant to Section  7.1(e)  thereof;  provided,  however,
that if the  Option is  exercisable  but  cannot be  exercised  by reason of any
applicable  government  order or  because  the  waiting  period  related  to the
issuance of the Option  Shares  under the HSR Act shall not have expired or been
terminated,  or because any other  condition to closing has not been  satisfied,
then the Option  shall not  terminate  until the tenth  business  day after such
impediment  to exercise  shall have been  removed or shall have become final and
not subject to appeal.

     (d) If ACQUIROR  receives  proceeds in  connection  with any sales or other
dispositions of this Option (or any rights hereunder) or Option Shares, plus any
dividends   received  by  ACQUIROR  declared  on  Option  Shares  (including  by
exercising the ACQUIROR Put described in Section 6(a) hereof),  of more than the
sum of (x) $1,500,000  plus (y) the Exercise  Price  multiplied by the number of
Target Shares purchased by ACQUIROR pursuant to the Option, then all proceeds to
ACQUIROR  in excess of such sum shall be  remitted  by  ACQUIROR  to Target.  

3.   Conditions to Closing.

                  The  obligation  of Target to issue Option  Shares to ACQUIROR
hereunder is subject to the conditions that (a) any waiting period under the HSR
Act applicable to the issuance of the Option Shares hereunder shall have expired
or  been  terminated;   (b)  all  material   consents,   approvals,   orders  or
authorizations of, or registrations,  declarations or filings with, any Federal,
state or local  administrative  agency or  commission  or other Federal state or
local governmental authority or instrumentality,  if any, required in connection
with the issuance of the Option  Shares  hereunder  shall have been  obtained or
made,  as the case may be; and (c) no  preliminary  or permanent  injunction  or
other order by any court of  competent  jurisdiction  prohibiting  or  otherwise
restraining  such issuance shall be in effect.  It is understood and agreed that
at any time  during  which  ACQUIROR  shall be  entitled to deliver to Target an
Exercise  Notice,  the parties will use their respective best efforts to satisfy
all  conditions  to  Closing,  so that a Closing  may take place as  promptly as
practicable, and in any event, upon the occurrence of an Exercise Event.

4.   Closing.

                  At any Closing,  (a) Target shall deliver to ACQUIROR a single
certificate  in  definitive  form  representing  the  number  of  Target  Shares
designated by ACQUIROR in its Exercise  Notice  consistent  with this Agreement,
such certificate to be registered in the name of ACQUIROR and to bear the legend
set forth in Section 10 hereof,  against  delivery of (b) payment by ACQUIROR to
Target of the aggregate  purchase  price for the Target Shares so designated and
being  purchased by delivery of a certified  check or bank check in  immediately
available funds.

5.   Representations and Warranties of Target.

                  Target  represents and warrants to ACQUIROR that (a) Target is
a corporation  duly organized,  validly  existing and in good standing under the
laws of the State of Delaware and has the corporate power and authority to enter
into  this  Agreement  and to  carry  out  its  obligations  hereunder;  (b) the
execution and delivery of this Agreement by Target and consummation by Target of
the transactions  contemplated hereby have been duly authorized by all necessary
corporate action on the part of Target and no other corporate proceedings on the
part  of  Target  are  necessary  to  authorize  this  Agreement  or  any of the
transactions  contemplated hereby; (c) this Agreement has been duly executed and
delivered by Target and  constitutes  a legal,  valid and binding  obligation of
Target and,  assuming  this  Agreement  constitutes  a legal,  valid and binding
obligation of ACQUIROR,  is enforceable  against  Target in accordance  with its
terms;  (d) except for any filings  required under the HSR Act, Target has taken
all  necessary  corporate and other action to authorize and reserve for issuance
and to permit it to issue upon exercise of the Option, and at all times from the
date hereof until the termination of the Option will have reserved for issuance,
a  sufficient  number of unissued  Target  Shares for  ACQUIROR to exercise  the
Option  in full and will  take  all  necessary  corporate  or  other  action  to
authorize  and  reserve  for  issuance  all  additional  Target  Shares or other
securities  which may be issuable  pursuant to Section 8(a) upon exercise of the
Option,  all of which,  upon their issuance and delivery in accordance  with the
terms of this Agreement,  will be validly issued,  fully paid and nonassessable;
(e) upon delivery of the Target Shares and any other securities to ACQUIROR upon
exercise of the  Option,  ACQUIROR  will  acquire  such  Target  Shares or other
securities free and clear of all material claims, liens,  charges,  encumbrances
and security interests of any kind or nature whatsoever, excluding those imposed
by ACQUIROR;  (f) the execution and delivery of this Agreement by Target do not,
and the  performance  of this  Agreement  by Target  will not,  (i)  violate the
Certificate of Incorporation or Bylaws of Target,  (ii) conflict with or violate
any order  applicable to Target or any of its  subsidiaries  or by which they or
any of their  property is bound or affected or (iii)  result in any breach of or
constitute  a default  (or an event  which with  notice or lapse of time or both
would  become a  default)  under,  or give  rise to any  right  of  termination,
amendment,  acceleration or cancellation of, or result in the creation of a lien
or  encumbrance  on any property or assets of Target or any of its  subsidiaries
pursuant  to,  any  contract  or  agreement  to  which  Target  or  any  of  its
subsidiaries is a party or by which Target or any of its  subsidiaries or any of
their  property is bound or  affected,  except,  in the case of clauses (ii) and
(iii)  above,  for  violations,   conflicts,   breaches,   defaults,  rights  of
termination,  amendment,  acceleration  or  cancellation,  liens or encumbrances
which  would not,  individually  or in the  aggregate,  have a Material  Adverse
Effect on Target; and (g) the execution and delivery of this Agreement by Target
does not, and the performance of this Agreement by Target will not,  require any
consent,  approval,  authorization or permit of, or filing with, or notification
to, any Governmental Entity except pursuant to the HSR Act.

6.   Certain Rights

     (a) ACQUIROR Put.  ACQUIROR may deliver to Target a written  notice (a "Put
Notice")  at any time during  which  ACQUIROR  may  deliver an  Exercise  Notice
specifying  that it wishes to sell the  Option,  to the  extent  not  previously
exercised,  at the price  set forth in  subparagraph  (i) below (as  limited  by
subparagraph  (iii) below),  and the Option Shares, if any, acquired by ACQUIROR
pursuant thereto,  at the price set forth in subparagraph (ii) below (as limited
by  subparagraph  (iii) below) (the "Put").  At any time after delivery of a Put
Notice, unless such Put Notice is withdrawn by ACQUIROR,  the closing of the Put
(the "Put Closing") shall take place at the principal offices of Target upon the
occurrence of an Exercise  Event or at such later date prior to the  termination
of the Option as may be designated by ACQUIROR in writing.  In the event that no
Exercise Event shall occur prior to  termination of the Option,  such Put Notice
shall be void and of no further force and effect.:

     (i) The  difference  between  the  "Market/Tender  Offer  Price" for Target
Shares as of the date ACQUIROR gives notice of its intent to exercise its rights
under this  Section  6(a)  (defined as the higher of (A) the  highest  price per
share offered as of such date pursuant to any Alternative  Transaction which was
made prior to such date and not  terminated or withdrawn as of such date and (B)
the highest  closing sale price of Target Shares on the Nasdaq  National  Market
during the twenty  (20)  trading  days  ending on the  trading  day  immediately
preceding such date) and the Exercise Price,  multiplied by the number of Target
Shares purchasable  pursuant to the Option, but only if the Market/Tender  Offer
Price is greater  than the  Exercise  Price.  For  purposes of  determining  the
highest price offered  pursuant to any  Alternative  Transaction  which involves
consideration other than cash, the value of such consideration shall be equal to
the  higher of (x) if  securities  of the same  class of the  proponent  as such
consideration  are  traded  on  any  national  securities  exchange  or  by  any
registered  securities  association,  a value based on the closing sale price or
asked price for such securities on their  principal  trading market on such date
and (y) the  value  ascribed  to such  consideration  by the  proponent  of such
Alternative Transaction,  or if no such value is ascribed, a value determined in
good faith by the Board of Directors of Target.

     (ii) The  Exercise  Price  paid by  ACQUIROR  for  Target  Shares  acquired
pursuant to the Option plus the difference between the Market/Tender Offer Price
and such Exercise  Price (but only if the  Market/Tender  Offer Price is greater
than the Exercise Price) multiplied by the number of Target Shares so purchased.

     (iii)  Notwithstanding  subparagraphs (i) and (ii) above,  pursuant to this
Section 6 Target shall not be required to pay ACQUIROR in excess of an aggregate
of (A) (x)  $1,500,000  plus (y) the Exercise  Price paid by ACQUIROR for Target
Shares  acquired  pursuant to the Option and put to Target pursuant to Section 6
minus (B) the gain received by ACQUIROR on sale(s) of this Option (or any rights
hereunder) or Option Shares to third parties. The parties intend ACQUIROR profit
received  pursuant to this Option and the Option Shares not to exceed $1,500,000
in  the  aggregate  and  Section  3(d)  and  Section  6(a)(iii)  shall  be  read
collectively to achieve such purpose.

     (b) Payment and Redelivery of Option or Shares. At the Put Closing,  Target
shall pay the required  amount to ACQUIROR in  immediately  available  funds and
ACQUIROR shall  surrender to Target the Option and the  certificates  evidencing
the Target Shares purchased by ACQUIROR pursuant thereto.

7.   Registration Rights

     (a) Following the termination of the Merger Agreement,  ACQUIROR (sometimes
referred to herein as a "Holder") may by written notice  (sometimes  referred to
herein as the "Registration  Notice") to Target (the  "Registrant")  request the
Registrant to register  under the  Securities  Act all or any part of the shares
acquired  by  such  Holder   pursuant  to  this  Agreement   (the   "Registrable
Securities")  in order to permit the sale or other  disposition  of such  shares
pursuant to a bona fide firm  commitment  underwritten  public offering in which
the Holder and the  underwriters  shall  effect as wide a  distribution  of such
Registrable  Securities as is reasonably  practicable  and shall use  reasonable
efforts to prevent any person or group from  purchasing  through  such  offering
shares  representing  more than 1% of the outstanding  shares of Common Stock of
the  Registrant on a fully diluted  basis (a  "Permitted  Offering");  provided,
however,  that any such  Registration  Notice  must relate to a number of shares
equal to at least 2% of the outstanding shares of Common Stock of the Registrant
on a fully diluted basis and that any rights to require  registration  hereunder
shall  terminate  with  respect to any shares that may be sold  pursuant to Rule
144(k)  under the  Securities  Act.  The  Registration  Notice  shall  include a
certificate executed by the Holder and its proposed managing underwriter,  which
underwriter shall be an investment  banking firm of  internationally  recognized
standing reasonably acceptable to the Company (the "Manager"),  stating that (i)
the Holder and the Manager  have a good faith  intention to commence a Permitted
Offering  and (ii) the Manager in good faith  believes  that,  based on the then
prevailing market conditions, it will be able to sell the Registrable Securities
at a per  share  price  equal to at least 80% of the per  share  average  of the
closing  sale prices of the  Registrant's  Common  Stock on the Nasdaq  National
Market  for the  twenty  trading  days  immediately  preceding  the  date of the
Registration  Notice. The Registrant shall thereupon have the option exercisable
by written  notice  delivered to the Holder  within ten business  days after the
receipt of the Registration Notice,  irrevocably to agree to purchase all or any
part of the  Registrable  Securities  for cash at a price (the  "Option  Price")
equal to the product of (i) the number of  Registrable  Securities  so purchased
and (ii) the per share  average of the closing  sale prices of the  Registrant's
Common  Stock  on the  Nasdaq  National  Market  for  the  twenty  trading  days
immediately  preceding the date of the Registration Notice. Any such purchase of
Registrable Securities by the Registrant hereunder shall take place at a closing
to be held at the principal  executive  offices of the Registrant or its counsel
at any  reasonable  date and time  designated  by the  Registrant in such notice
within 10  business  days after  delivery  of such  notice.  The payment for the
shares to be purchased  shall be made by delivery at the time of such closing of
the Option Price in immediately available funds.

     (b) If the  Registrant  does not elect to  exercise  its option to purchase
pursuant  to  Section  7(a) with  respect  to all  Registrable  Securities,  the
Registrant  shall  use  all  reasonable   efforts  to  effect,  as  promptly  as
practicable,  the  registration  under  the  Securities  Act of the  unpurchased
Registrable  Securities  requested to be registered in the Registration  Notice;
provided,  however,  that (i) the Holder  shall not be  entitled to more than an
aggregate  of two  effective  registration  statements  hereunder  and  (ii) the
Registrant will not be required to file any such  registration  statement during
any  period of time (not to exceed 40 days  after a  Registration  Notice in the
case of clause (A) below or 90 days after a  Registration  Notice in the case of
clauses (B) and (C) below) when (A) the  Registrant is in possession of material
non-public  information which it reasonably  believes would be detrimental to be
disclosed  at  such  time  and,  in the  written  opinion  of  counsel  to  such
Registrant,  such  information  would  have to be  disclosed  if a  registration
statement  were filed at that time;  (B) such  Registrant is required  under the
Securities Act to include  audited  financial  statements for any period in such
registration  statement and such financial  statements are not yet available for
inclusion in such registration statement; or (C) such Registrant determines,  in
its  reasonable  judgment,  that  such  registration  would  interfere  with any
financing,  acquisition or other material transaction  involving the Registrant.
If  consummation  of  the  sale  of any  Registrable  Securities  pursuant  to a
registration  hereunder does not occur within 180 days after the filing with the
SEC of the initial  registration  statement  therefor,  the  provisions  of this
Section 7 shall  again be  applicable  to any  proposed  registration,  it being
understood that neither party shall be entitled to more than an aggregate of two
effective  registration  statements  hereunder.  The  Registrant  shall  use all
reasonable efforts to cause any Registrable  Securities  registered  pursuant to
this Section 7 to be qualified for sale under the securities or blue sky laws of
such  jurisdictions as the Holder may reasonably request and shall continue such
registration  or  qualification  in  effect  in  such  jurisdictions;  provided,
however, that the Registrant shall not be required to qualify to do business in,
or consent to general service of process in, any  jurisdiction by reason of this
provision.  

     (c) The registration  rights set forth in this Section 7 are subject to the
condition  that the Holder shall provide the  Registrant  with such  information
with respect to such Holder's Registrable Securities,  the plan for distribution
thereof,  and such other  information  with  respect  to such  Holder as, in the
reasonable  judgment of counsel for the  Registrant,  is necessary to enable the
Registrant to include in a registration statement all material facts required to
be disclosed with respect to a registration thereunder.

     (d) A  registration  effected under this Section 7 shall be effected at the
Registrant's expense,  except for underwriting discounts and commissions and the
fees and  expenses of counsel to the Holder,  and the  Registrant  shall use all
reasonable efforts to provide to the underwriters such documentation  (including
certificates,  opinions of counsel and "comfort"  letters from  auditors) as are
customary  in  connection  with  underwritten   public  offerings  and  as  such
underwriters may reasonably  require.  In connection with any registration,  the
Holder  and  the  Registrant  agree  to  enter  into an  underwriting  agreement
reasonably  acceptable to each such party,  in form and substance  customary for
transactions of this type with the underwriters  participating in such offering.

     (e) Indemnification

     (i) The  Registrant  will  indemnify the Holder,  each of its directors and
officers and each person who  controls the Holder  within the meaning of Section
15 of the Securities Act, and each underwriter of the  Registrant's  securities,
with respect to any  registration,  qualification  or compliance  which has been
effected  pursuant to this  Agreement,  against all  expenses,  claims,  losses,
damages or  liabilities  (or actions in respect  thereof),  including any of the
foregoing  incurred in settlement of any  litigation,  commenced or  threatened,
arising out of or based on any untrue statement (or alleged untrue statement) of
a material fact contained in any registration  statement,  prospectus,  offering
circular or other document, or any amendment or supplement thereto,  incident to
any such registration, qualification or compliance, or based on any omission (or
alleged omission) to state therein a material fact required to be stated therein
or necessary to make the statements  therein,  in light of the  circumstances in
which they were made, not misleading,  or any violation by the Registrant of any
rule or  regulation  promulgated  under the  Securities  Act  applicable  to the
Registrant  in  connection  with  any  such   registration,   qualification   or
compliance,  and the  Registrant  will  reimburse  the Holder  and,  each of its
directors  and  officers  and each  person who  controls  the Holder  within the
meaning of Section 15 of the Securities Act, and each  underwriter for any legal
and any other expenses  reasonably  incurred in connection  with  investigating,
preparing  or  defending  any such claim,  loss,  damage,  liability  or action,
provided that the  Registrant  will not be liable in any such case to the extent
that any such claim,  loss,  damage,  liability  or expense  arises out of or is
based on any untrue  statement  or  omission  or  alleged  untrue  statement  or
omission,  made in reliance  upon and in  conformity  with  written  information
furnished to the Registrant by such Holder or director or officer or controlling
person or underwriter seeking indemnification.

     (ii) The Holder will  indemnify the  Registrant,  each of its directors and
officers and each  underwriter of the  Registrant's  securities  covered by such
registration  statement and each person who controls the  Registrant  within the
meaning of Section 15 of the Securities Act, against all claims, losses, damages
and liabilities (or actions in respect thereof),  including any of the foregoing
incurred in settlement of any litigation,  commenced or threatened,  arising out
of or based on any untrue statement (or alleged untrue  statement) of a material
fact contained in any such registration statement, prospectus, offering circular
or other  document,  or any  omission (or alleged  omission) to state  therein a
material fact required to be stated  therein or necessary to make the statements
therein not misleading, or any violation by the Holder of any rule or regulation
promulgated under the Securities Act applicable to the Holder in connection with
any such  registration,  qualification  or  compliance,  and will  reimburse the
Registrant, such directors,  officers or control persons or underwriters for any
legal  or  any  other   expenses   reasonably   incurred  in   connection   with
investigating, preparing or defending any such claim, loss, damage, liability or
action,  in each case to the extent,  but only to the  extent,  that such untrue
statement (or alleged  untrue  statement)  or omission (or alleged  omission) is
made in such  registration  statement,  prospectus,  offering  circular or other
document in reliance upon and in conformity with written  information  furnished
to the Registrant by the Holder for use therein, provided that in no event shall
any indemnity  under this Section 8(e) exceed the gross proceeds of the offering
received by the Holder. 

     (iii) Each party entitled to  indemnification  under this Section 7(e) (the
"Indemnified  Party")  shall  give  notice  to the  party  required  to  provide
indemnification (the "Indemnifying Party") promptly after such Indemnified Party
has actual knowledge of any claim as to which indemnity may be sought, and shall
permit the  Indemnifying  Party to assume  the  defense of any such claim or any
litigation  resulting  therefrom,  provided  that  counsel for the  Indemnifying
Party,  who shall  conduct  the  defense of such claim or  litigation,  shall be
approved by the  Indemnified  Party (whose  approval shall not  unreasonably  be
withheld),  and the  Indemnified  Party may  participate in such defense at such
party's expense;  provided,  however, that the Indemnifying Party shall pay such
expense if  representation  of the Indemnified  Party by counsel retained by the
Indemnifying  Party would be inappropriate due to actual or potential  differing
interests  between the Indemnified Party and any other party represented by such
counsel  in such  proceeding,  and  provided  further  that the  failure  of any
Indemnified  Party to give  notice as  provided  herein  shall not  relieve  the
Indemnifying Party of its obligations under this Section 7(e) unless the failure
to give such notice is materially prejudicial to an Indemnifying Party's ability
to defend such action.  No Indemnifying  Party, in the defense of any such claim
or litigation shall, except with the consent of each Indemnified Party,  consent
to entry of any judgment or enter into any settlement  which does not include as
an  unconditional  term  thereof the giving by the claimant or plaintiff to such
Indemnified  Party of a release  from all  liability in respect to such claim or
litigation. No Indemnifying Party shall be required to indemnify any Indemnified
Party with respect to any  settlement  entered  into  without such  Indemnifying
Party's prior consent (which shall not be unreasonably withheld).

8.   Adjustment Upon Changes in Capitalization; Rights Plans

     (a) In the  event of any  change  in the  Target  Shares by reason of stock
dividends,  stock splits, reverse stock splits, mergers (other than the Merger),
recapitalizations,  combinations, exchanges of shares and the like, the type and
number of shares or  securities  subject to the Option  and the  Exercise  Price
shall be  adjusted  appropriately,  and  proper  provision  shall be made in the
agreements  governing such  transaction  so that ACQUIROR  shall  receive,  upon
exercise of the Option,  the number and class of shares or other  securities  or
property  that  ACQUIROR  would have received in respect of the Target Shares if
the Option had been exercised immediately prior to such event or the record date
therefor, as applicable.

     (b) At any time  during  which the Option is  exercisable,  and at any time
after the Option is exercised (in whole or in part, if at all), Target shall not
amend  its  Rights  Agreement  nor  adopt a new  stockholders  rights  plan that
contains  provisions for the distribution of rights thereunder soley as a result
of  ACQUIROR  being  the  beneficial  owner of shares of Target by virtue of the
Option being  exercisable or having been exercised (or as a result of such other
party beneficially owning shares issuable in respect of any Option Shares).

9.   Restrictive Legends

                  Each certificate representing Option Shares issued to ACQUIROR
hereunder shall include a legend in substantially the following form:

         THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED
         UNDER THE SECURITIES  ACT OF 1933, AS AMENDED,  AND MAY BE REOFFERED OR
         SOLD ONLY IF SO REGISTERED OR IF AN EXEMPTION FROM SUCH REGISTRATION IS
         AVAILABLE.  SUCH SECURITIES ARE ALSO SUBJECT TO ADDITIONAL RESTRICTIONS
         ON  TRANSFER  AS SET FORTH IN THE STOCK  OPTION  AGREEMENT  DATED AS OF
         OCTOBER 25, 1998, A COPY OF WHICH MAY BE OBTAINED FROM THE ISSUER.

10.  Listing and HSR Filing

                  Target,  upon the request of ACQUIROR,  shall promptly file an
application to list the Target Shares to be acquired upon exercise of the Option
for quotation on the Nasdaq National Market and shall use its reasonable efforts
to obtain  approval of such listing as soon as  practicable.  Promptly after the
date hereof,  each of the parties  hereto shall  promptly  file with the Federal
Trade Commission and the Antitrust  Division of the United States  Department of
Justice  all  required  pre-merger  notification  and  report  forms  and  other
documents  and  exhibits  required  to be filed  under the HSR Act to permit the
acquisition of the Target Shares subject to the Option at the earliest  possible
date.

11.  Binding Effect

                  This Agreement  shall be binding upon and inure to the benefit
of the parties hereto and their  respective  successors  and permitted  assigns.
Nothing contained in this Agreement,  express or implied,  is intended to confer
upon any person other than the parties  hereto and their  respective  successors
and permitted  assigns any rights or remedies of any nature whatsoever by reason
of this Agreement.  Certificates representing shares sold in a registered public
offering  pursuant  to  Section 7 shall not be  required  to bear the legend set
forth in Section 9.

12.  Specific Performance

                  The parties  recognize and agree that if for any reason any of
the  provisions of this  Agreement  are not  performed in accordance  with their
specific  terms or are otherwise  breached,  immediate and  irreparable  harm or
injury would be caused for which money damages would not be an adequate  remedy.
Accordingly,  each party  agrees that in addition  to other  remedies  the other
party shall be entitled to an injunction restraining any violation or threatened
violation  of the  provisions  of this  Agreement.  In the event that any action
shall be brought in equity to enforce the provisions of the  Agreement,  neither
party will allege,  and each party hereby  waives the defense,  that there is an
adequate remedy at law.

13.  Entire Agreement

                  This  Agreement  and  the  Merger  Agreement   (including  the
appendices and exhibits  thereto)  constitute the entire  agreement  between the
parties with respect to the subject  matter hereof and supersede all other prior
agreements and  understandings,  both written and oral, between the parties with
respect to the subject matter hereof.

14.  Further Assurances

                  Each party will execute and deliver all such further documents
and instruments and take all such further action as may be necessary in order to
consummate the transactions contemplated hereby.

15.  Validity

                  The  invalidity or  unenforceability  of any provision of this
Agreement  shall  not  affect  the  validity  or  enforceability  of  the  other
provisions of this  Agreement,  which shall remain in full force and effect.  In
the event any Governmental Entity of competent  jurisdiction holds any provision
of this Agreement to be null,  void or  unenforceable,  the parties hereto shall
negotiate  in good faith and shall  execute  and  deliver an  amendment  to this
Agreement  in  order,  as nearly  as  possible,  to  effectuate,  to the  extent
permitted  by law,  the  intent  of the  parties  hereto  with  respect  to such
provision.

16.  Notices

                  All notices  and other  communications  hereunder  shall be in
writing  and shall be deemed  given if  delivered  personally  or by  commercial
delivery service, or sent via telecopy (receipt confirmed) to the parties at the
following  addresses or telecopy  numbers (or at such other  address or telecopy
numbers for a party as shall be specified by like notice):

(i)                                     if to ACQUIROR, to:

                                        Legato Systems, Inc.
                                        3210 Porter Drive
                                        Palo Alto, CA  94304
                                        Attention:  Louis C. Cole
                                        Facsimile No.: (650) 812-6032
                                        Telephone No.: (650) 812-6000

                                        with a copy to:

                                        Gunderson Dettmer Stough Villeneuve
                                        Franklin & Hachigian, LLP
                                        155 Constitution Drive
                                        Menlo Park, CA  94025
                                        Attention:  Robert V. Gunderson, Jr.
                                        Facsimile No.: (650) 321-2800
                                        Telephone No.: (650) 463-5200
<PAGE>

(ii)                                    if to Target, to:

                                        Qualix Group, Inc.
                                        177 Bovet Road, Second Floor
                                        San Mateo Road, CA  94402
                                        Attention:  Richard G. Thau
                                        Facsimile No.: (650) 572-0200
                                        Telephone No.: (650) 572-1300

                                        with a copy to:

                                        Wilson Sonsini Goodrich & Rosati. P.C.
                                        650 Page Mill Road
                                        Palo Alto, CA  94303
                                        Attention:  Jeffrey D. Saper
                                        Facsimile No.: (650) 493-6811
                                        Telephone No.: (650) 493-9300




17.  Governing Law

                  This   Agreement   shall  be  governed  by  and  construed  in
accordance with the laws of the State of Delaware  applicable to agreements made
and to be performed entirely within such State.

18.  Counterparts

                  This  Agreement may be executed in two  counterparts,  each of
which  shall be deemed to be an  original,  but both of which,  taken  together,
shall constitute one and the same instrument.

19.  Expenses

                  Except as otherwise expressly provided herein or in the Merger
Agreement,  all costs and expenses  incurred in connection with the transactions
contemplated  by  this  Agreement  shall  be paid by the  party  incurring  such
expenses.

20.  Amendments; Waiver

                  This  Agreement  may be amended by the parties  hereto and the
terms and  conditions  hereof  may be waived  only by an  instrument  in writing
signed on behalf of each of the parties hereto,  or, in the case of a waiver, by
an instrument signed on behalf of the party waiving compliance.

21.  Assignment

                  Target may not sell, transfer,  assign or otherwise dispose of
any of its rights or  obligations  under this  Agreement  or the Option  created
hereunder to any other person,  without the express written consent of ACQUIROR.
The  rights  and  obligations  hereunder  shall  inure to the  benefit of and be
binding upon any successor of a party hereto.



<PAGE>




                  IN WITNESS  WHEREOF,  the  parties  hereto  have  caused  this
Agreement to be executed by their respective duly authorized  officers as of the
date first above written.



                                   QUALIX GROUP, INC.



                                   By:    /s/ Richard G. Thau
                                          Richard G. Thau
                                          President and Chief Executive Officer


                                   LEGATO SYSTEMS, INC.



                                   By:    /s/ Louis C. Cole
                                          Louis C. Cole
                                          President and Chief Executive Officer


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