Document:

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                                      [LOGO]

March 13, 2000

Mr. E. Vasko
255 North Road, Unit 30
Chelmsford, MA 01824

RE: OFFER OF EMPLOYMENT
-----------------------

Dear Ed:

Authoriszor Inc. is pleased to offer you the position of DIRECTOR, TECHNOLOGY.
The details of your offer are as follows:

     -   Start Date:                 April 3, 2000
     -   Annual Base Salary:         $115,000
     -   Annual Incentive Bonus:      $15,000 (Objectives to be agreed)
     -   Annual Target Income:       $130,000
     -   Vested Stock Options:         20,000 (Vest over 4 years, at 25%
                                     per year. Options vest immediately if
                                     Authoriszor is acquired prior to
                                     completion of vesting period).
     -   Benefits:                   Reimbursement of COBRA Health & Dental
                                     benefits from current employer. LTD
                                     and Term Life benefits to be implemented
                                     with company benefits plan.
     -   Relocation Expenses:        Company will reimburse pro rata expenses
                                     of relocation, being reimbursed by
                                     current employer, not to exceed $31,000.
     -   Proposed Duties:            - Product Manager for U.S. market;
                                     - establish and manage U.S. presales
                                       and professional services organizations.
                                     - assist in identifying technology partners
                                       for Authoriszor Inc.;
                                     - assist R&D with defining the integration
                                       of complementary functionality for our
                                       product suite.

Ed, I trust that this employment offer meets with your stated expectations.
If you have any questions, please give me a call at (508) 650-3916, or if
busy at (508) 655-7534.

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Ed Vasko
March 13, 2000
Page 2

Please sign and fax a copy of this letter to me confirming your acceptance of
this offer of employment.

I have advised David Wray of your planned March 18-19th travel plans for your
visit to the Authoriszor Inc. R&D facilities at Bradford, West Yorkshire. I
suggest that you speak directly with David directly so that he can assist you
with the arrangements for your transportation from/to the airport and to
recommend a local hotel for your stay in the U.K.

Ed, we are looking forward to your valued contributions to our Authoriszor
Team. I am confident that you will be pleased with Authoriszor's career
opportunity and the growth challenges that this position will offer to you.

With best regards,

Richard A. Langevin
President & CEO
Authoriszor Inc.

AGREED:                                ACCEPTED:

/s/ Ed Vasko                           /s/ Richard A. Langevin
------------------------------         -----------------------------------
    Ed Vasko                               Richard A. Langevin

        3/15/00                                   3/15/00
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Date                                   Date<PAGE>

                          AMENDMENT TO RIGHTS AGREEMENT

         THIS AMENDMENT (this "Amendment"), dated as of May 11, 2000, by and
between Hussmann International, Inc., a Delaware corporation (the "Company"),
and First Chicago Trust Company of New York, a New York corporation, as Rights
Agent (the "Rights Agent"), amends the Amended and Restated Rights Agreement,
dated as of July 15, 1999 (the "Rights Agreement").

                                 R E C I T A L S
                                 ---------------

         A. The Company intends to enter into an Agreement and Plan of Merger,
dated as of the date hereof (as it may be amended or supplemented from time to
time, the "Ingersoll Merger Agreement") among the Company, Ingersoll-Rand
Company, a New Jersey corporation ("Ingersoll"), and IR Merger Corporation, a
Delaware corporation ("Merger Sub") with respect to a merger of the Company and
Merger Sub (the "Merger").

         B. The Company and the Rights Agent have executed and entered into the
Rights Agreement.

         C. Pursuant to Section 27 of the Rights Agreement, the Company may from
time to time supplement or amend the Rights Agreement in accordance with the
provisions of Section 27 thereof.

         D. The Board of Directors has determined that the Merger and the other
transactions contemplated by the Ingersoll Merger Agreement are fair to and in
the best interests of the Company and its stockholders.

         E. The Board of Directors has determined that it is in the best
interests of the Company and its stockholders to amend the Rights Agreement to
exempt the Ingersoll Merger Agreement and the transactions contemplated by the
Ingersoll Merger Agreement from the application of the Rights Agreement.

                                A G R E E M E N T

         NOW, THEREFORE, the Rights Agreement is hereby amended as follows:

         1. The definition of "Acquiring Person" in Section 1(a) of the Rights
Agreement is hereby modified and amended by adding the following sentence at the
end of the last sentence thereof:

            "Notwithstanding anything in this Agreement to the
            contrary, neither Ingersoll-Rand Company, a New Jersey
            corporation ("Ingersoll"), nor any direct or indirect
            wholly owned subsidiary of Ingersoll shall be deemed to
            be an Acquiring Person solely as a result of the
            approval, execution or delivery of the Agreement and
            Plan of Merger, dated as of May 11, 2000, among
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            the Company, Ingersoll, and IR Merger Corporation, a
            Delaware corporation ("Merger Sub") (as it may be
            amended from time to time, the "Ingersoll Merger
            Agreement"), or the consummation of the merger of the
            Company and Merger Sub (the "Merger") or the other
            transactions contemplated by the Ingersoll Merger
            Agreement."

         2. Section 7(a) of the Rights Agreement is hereby modified, amended and
restated in its entirety as follows:

            "Subject to Section 7(e) hereof, the registered holder
            of any Rights Certificate may exercise the Rights
            evidenced thereby (except as otherwise provided herein
            including, without limitation, the restrictions on
            exercisablity set forth in Section 9(c) and Section
            11(a)(iii)) in whole or in part at any time after the
            Distribution Date upon surrender of the Rights
            Certificate, with the form of election to purchase on
            the reverse side thereof duly executed, to the Rights
            Agent at the office or offices of the Rights Agent
            designated for such purpose, together with payment of
            the aggregate Purchase Price with respect to the total
            number of one one-hundredths of a share of Preferred
            Stock (or other securities, cash or other assets, as the
            case may be) as to which surrendered Rights are then
            exercisable, at or prior to the earliest of (i) the
            close of business on December 31, 2007 (the "Final
            Expiration Date"), (ii) the time at which the Rights are
            redeemed as provided in Section 23 hereof (the
            "Redemption Date"), (iii) the time at which such Rights
            are exchanged pursuant to Section 24 hereof, or (iv) the
            time immediately prior to the initial purchase of shares
            of Common Stock in the tender offer contemplated by the
            Ingersoll Merger Agreement."

         3. Section 15 of the Rights Agreement is hereby modified and amended to
add the following sentence at the end thereof:

            "Nothing in this Agreement shall be construed to give
            any holder of Rights or any other Person any legal or
            equitable rights, remedy or claim under this Agreement
            in connection with any transactions contemplated by the
            Ingersoll Merger Agreement."

         4. The Rights Agreement is hereby further modified and amended by
adding a new Section 33 to the end thereof to read in its entirety as follows:

                                       2
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            "Section 36. INGERSOLL MERGER AGREEMENT. Notwithstanding
            any other provision of this Agreement, neither the
            approval, execution or delivery of the Ingersoll Merger
            Agreement nor the consummation of the Offer (as defined
            in the Ingersoll Merger Agreement), the Merger or the
            other transactions contemplated by the Ingersoll Merger
            Agreement is or shall be deemed to be an event described
            in Section 11(a)(ii) or Section 13 hereof, nor will such
            performance or consummation result in the occurrence of
            a Stock Acquisition Date, a Distribution Date or any
            other separation of the Rights from the underlying
            Common Stock, nor entitle or permit the holders of the
            Rights to exercise the Rights or otherwise affect the
            rights of the holders of the Rights, including giving
            the holders of the Rights the right to acquire
            securities of any party to the Ingersoll Merger
            Agreement."

         5. This Amendment may be executed in any number of counterparts, each
of which shall be an original, but such counterparts shall together constitute
one and the same instrument.

         6. This Amendment shall be deemed to be a contract made under the laws
of the State of Delaware and for all purposes shall be governed by and construed
in accordance with the laws of such State applicable to contracts to be made and
performed entirely within such State.

         [The remainder of this page has been intentionally left blank]

                                       3
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         IN WITNESS WHEREOF, this Amendment has been duly executed by the
Company and the Rights Agent as of the day and year first written above.

                                       HUSSMANN INTERNATIONAL, INC.

                                       By: /s/ Burton Halpern
                                           ------------------------------------
                                           Name:  Burton Halpern
                                           Title: Vice President

                                       FIRST CHICAGO TRUST COMPANY OF NEW YORK

                                       By: /s/ Michael S. Duncan
                                           ------------------------------------
                                           Name:  Michael S. Duncan
                                           Title: Director, Corporate Actions

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