Document:

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EXHIBIT 4.7 AMENDMENT TO LINE OF CREDIT AGREEMENT BETWEEN BANK ONE AND AMERICAN
MEDICAL TECHNOLOGIES, INC. DATED MARCH 23, 2001

March 20, 2001

Mr. Justin Grubbs
Chief Financial Officer
American Medical Technologies, Inc.
5555 Bear Lane
Corpus Christi, Texas 78405

Re: Amendment to the Revolving Business Credit Note (LIBOR - Based Interest
Rate) (the "Note") and Line of Credit Agreement, (the "Agreement") both dated
September 21, 2000

Dear Justin:

This letter, when executed by American Medical Technologies, Inc. and returned
to Bank One, Michigan will amend the following sections of the above referenced
documents.

The Note is amended by restating the definition of "Applicable Margin" as
follows:
         "Applicable Margin" means, with respect to any Floating Rate Loan, 0%
per annum and, with respect to any Eurodollar Loan, 2.5% per annum until the
Cash Flow Coverage Ratio, as defined in the Credit Agreement is not less than
2.00:1.00 for the fiscal quarter immediately preceding calculation, and,
thereafter, 1.5% per annum.

The Agreement is amended as follows:

Section 5.7 is amended by adding the following:

C.      Within 30 days after and as of the end of each calendar month, the
following lists, each certified as correct by one of its authorized agents:
                  (1) a list of accounts receivable, aged from date of invoice;
                  (2) a list of inventory, valued at the lower of cost or
                  market;
                  (3) a borrowing base certificate in form and substance
                  satisfactory to the Bank calculating the Borrowing Base in
                  accordance with paragraph 16 as of the last day of such month.

Section 6.3 (H) is amended by replacing $7,500,000.00 with $9,000,000.00.

Section 6.3 (J) is replaced in its entirety as follows:
Cash Flow Coverage Ratio. Permit the ratio of the Borrower's EBITDA to its Debt
Service to be less than 2.00 to 1.00 calculated as of March 31, 2001, for fiscal
quarter then ending, as of June 31, 2001 for the six months then ending, and as
of September 30, 2001 for the nine months then ending, and as of December 31,
2001, and for each quarter thereafter, for the four quarter period ending on the
last day of the fiscal quarter immediately preceding the date of calculation.

The following is added as Section 16:

Borrowing Base. Notwithstanding any other provision of this Agreement, the
aggregate principal amount outstanding at any one time under Facility A shall
not exceed the lesser of the Borrowing Base or $7,500,000.00. In the event the
outstandings exceed such amount, Borrower shall immediately prepay the
outstandings under Facility A in an amount not less than such excess. Borrowing
Base means:

A.      80% of the Borrower's trade accounts receivable in which the Bank has a
perfected, first priority security interest, excluding accounts more than 90
days past due from the date of invoice, accounts subject to offset or defense,
government, bonded, affiliate and foreign accounts not covered by trade credit
insurance acceptable to the Bank, accounts from trade debtors of which more than
50% of the aggregate amount owing from the trade debtor to the Borrower is more
than 90 days past due, and accounts otherwise unacceptable to the Bank, plus,

                                      36
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B.      Inventory of the Borrower in which the Bank has a perfected first
priority security interest, valued at the lower of cost or market but not
exceeding $3,500,000.00 in the aggregate, as follows:

        (1) 50% of raw material inventory; and
        (2) 50% of finished goods inventory, plus,

C.      Prior to June 1, 2001, 50% of the net book value of the Borrower's
machinery and equipment in which the Bank has a perfected, first priority
security interest, plus

D.      Prior to June 1, 2001, 100% of the gross book value of the Borrower's
real property located at 5555 Bear Lane, Corpus Christi, Texas in which the Bank
has a perfected, first priority security interest. The Borrower shall deliver to
the Bank an executed mortgage, ALTA mortgage title insurance policy without
exceptions, mortgage survey certified to the Bank, Phase I environmental survey
and other environmental documentation required by the Bank and, where
applicable, an assignment of rents, subordinations of leases, and/or collateral
assignments of land contracts, all in form and substance satisfactory to the
Bank.

E.      On June 1, 2001, and thereafter, 85% of the appraised value as
established by an independent third party appraiser of recognized standing hired
by the Bank, of the Borrower's real property located at 5555 Bear Lane, Corpus
Christi, Texas.

No other term of condition of any Loan Document is changed by this amendment.

Please indicate your acceptance of these changes by having the appropriate
corporate officer sign this letter below and return it to my attention at the
address above.

With best regards,

/s/ Jim Wolfington
---------------------------
Jim Wolfington
Vice President

Accepted and agreed this 23rd day of March, 2001.

By: American Medical Technologies, Inc.

By: /s/ Ben J. Gallant                      Its: Chariman & CEO
   -------------------                           --------------

                                      37<PAGE>

EXHIBIT 10.13 AMENDED EMPLOYMENT AGREEMENT DATED MARCH 15, 2001 BETWEEN AMERICAN
MEDICAL TECHNOLOGIES, INC. AND BEN J. GALLANT

                                       2nd AMENDMENT TO EMPLOYMENT AGREEMENT

         This Agreement shall be effective as of the 1st day of August, 2001
between American Medical Technologies, Inc., a Delaware Corporation (the
"Company") and Ben J. Gallant ("Gallant").

         WHEREAS, the Company and Gallant entered into an Employment Agreement
dated August 1, 1999, and (the "Employment Agreement"), as amended, and

         WHEREAS, the Company and Gallant desire to extend the Employment
Agreement;

         NOW THEREFORE, for good and for valuable consideration, the parties
agree as follows:

         The Employment Agreement is extended from August 1, 2001 through July
         31, 2003 on the same terms and conditions with the sole exception being
         that the base salary of Gallant shall be $250,000 per year.

     IN WITNESS WHEREOF, the parties have hereunto set their hands as of the day
and year first above written.

                           American Dental Technologies, Inc.

                           By: /s/ John Vickers, III
                           -----------------------------------------------
                           John Vickers, III, Executive Vice President and
                           Secretary by Authority of Board of Directors on
                           March 15, 2001

                           /s/ Ben J. Gallant
                           -----------------------------------------------
                           Ben J. Gallant

                                      38<PAGE>

                                 AMENDMENT NO. 1

          This Amendment No. 1 to Employment Agreement (the "Amendment") is made
and entered into as of the 1st day of December, 2000, by and between Apropos
Technology, Inc. (the "Company") and Kevin G. Kerns ("Employee").

          WHEREAS, the Company and Employee entered into an Employment Agreement
dated as of January 1, 2000 (the "Employment Agreement"); and

          WHEREAS, the Company and Employee desire to amend the Employment
Agreement as more specifically set forth herein.

          NOW, THEREFORE, in consideration of the mutual covenants herein
contained, and in consideration of the employment of Employee by the Company,
the parties agree as follows:

          1.   COMPENSATION. Sections 2(a) and 2(b) of the Employment Agreement
               are amended and restated in their entirety as follows:

               "(a) Base Salary and Bonus. Beginning on the effective date of
               this Agreement, the Employee shall be paid a base salary (the
               "Base Compensation") of $210,000 per year, payable in accordance
               with the Company's standard payroll policies. The Board of
               Directors shall review Employee's performance and the Company's
               financial and operating results on at least an annual basis and
               shall adjust Employee's base salary as it deems appropriate based
               on such review.

               (b) Bonus. Employee shall also be eligible for a bonus of up to
               $125,000 for fiscal year 2000 and the first quarter of fiscal
               year 2001, based on the criteria set forth in Exhibit A. The
               bonus will be due and payable on the 15th day of May, 2001. The
               Board of Directors shall set bonus levels and targets for years
               after fiscal year 2000 as it deems appropriate. In the event
               Employee's employment with the Company terminates for any reason
               other than pursuant to Section 6(c) hereof (voluntary termination
               by the Employee) or 6(b)(ii) hereof (Termination for Cause),
               Employee shall be entitled to receive a pro rated bonus for such
               year, determined by dividing the aggregate bonus that he would
               have earned for the entire year (assuming he had remained
               employed for the entire year and the original revenue/milestone
               targets established for such year continued to apply) by the
               number of days (including weekends) during which he was employed
               by the Company during such year by 365. Such bonus shall be paid
               within thirty (30) days of the end of the relevant measurement
               period. If Employee's employment with the Company terminates
               pursuant to Section 6(c) hereof or Section 6(b)(ii) hereof,
               Employee shall be deemed to have forfeited his entire bonus for
               such year and no such bonus shall be due or payable by the
               Company."

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          2.   MISCELLANEOUS.

               (a)  The Employment Agreement shall remain in full force and
                    effect except as expressly set forth herein.

               (b)  This Amendment shall be governed by and construed in
                    accordance with the laws of the State of Illinois, without
                    regard to the conflicts of law rules of such state.

               (c)  This Amendment may be executed in one or more counterparts,
                    each of which shall be deemed an original and all of which,
                    together, shall constitute one and the same instrument.

               (d)  Capitalized terms used herein, but not otherwise defined,
                    shall have the meaning ascribed to them in the Employment
                    Agreement.

                                      * * *

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          IN WITNESS WHEREOF, the undersigned have executed this Amendment this
1st day of December, 2000.

COMPANY:

APROPOS TECHNOLOGY, INC.

By: /s/ Keith L. Crandell
   ---------------------------------
Its: Board Member
     -------------------------------

EMPLOYEE:

/s/ Kevin G. Kerns
-----------------------------------
Kevin G. Kerns

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                                    EXHIBIT A

          In the event that the Company's Share Price Increase (as defined
below) for the four quarters ending March 31, 2001, is higher than the Share
Price Increase for each member of the Peer Group (as defined below) for the same
period, then Employee shall be entitled to a bonus of $125,000.

          In the event that the Company's Share Price Increase for the four
quarters ending March 31, 2001, is the second highest in the Peer Group, then
Employee shall be entitled to a bonus of $62,500.

          Notwithstanding anything herein to the contrary, Share Price Increases
for any member of the Peer Group that has been the subject of a takeover or
merger or, at March 31, 2001 is rumored to be the subject of a takeover or
merger, shall not be considered.

          If the Company's Share Price Increase for the four quarters ending
March 31, 2001, as calculated above, is not the highest or second highest in the
Peer Group, Employee shall not be entitled to any bonus.

          "Share Price Increase" shall mean the amount equal to the difference
between the respective Average Close Price (as defined below) for the month of
April 2001 and the respective Average Close Price for the month of April 2000,
divided by the Average Close Price for the month of April 2000.

          "Average Close Price" shall mean the amount equal to the sum of the
respective closing prices for all trading days during the calendar month divided
by the number of trading days in such calendar month.

          "Peer Group" shall mean Quintus Corporation, Aspect Communications
Corporation, eShare Communications Inc., Interactive Intelligence Inc., Kana
Communication, Inc. and eGain Communications Corp.

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