Document:

THIRD AMENDMENT TO INVENTORY AND
                          ACCOUNTS RECEIVABLE LOAN AND
                               SECURITY AGREEMENT

         THIS THIRD AMENDMENT, dated as of the 30th day of November, 2000, is to
that certain Inventory and Accounts Receivable Loan and Security Agreement dated
as of February 28, 1997, as amended as of October 27, 1998 and as of April 30,
1999 (as amended thereby and hereby, the "Loan Agreement") by and between

         NDC AUTOMATION, INC., a corporation organized and existing under the
laws of the State of Delaware (the "Borrower"); and

         SUMMIT BUSINESS CAPITAL CORP., a New York corporation (the "Lender").

RECITALS:

         A. National Bank of Canada, a Canadian chartered bank, and National
Canada Business Corp., a Delaware corporation (collectively, the "Original
Lenders"), originally entered into the Loan Agreement with the Borrowers.

         B. Pursuant to the terms of a Loan Portfolio Sale and Purchase
Agreement dated as of June 21, 2000, Summit Commercial/Gibraltar Corp., a New
York corporation, acquired all rights of the Original Lenders to the Loan
Agreement and the documents executed in connection with the Loan Agreement.

         C. Summit Commercial/Gibraltar Corp. subsequently changed its name to
Summit Business Capital Corp.

         D. The Borrower and the Lender have agreed to make certain changes to
the Loan Agreement as set forth herein.

         NOW, THEREFORE, the parties hereto agree as follows:

         A. Section 3 of the Loan Agreement is deleted in its entirety and
replaced with the following.

                  "3. LOANS. Subject to the terms and provisions of this
         Agreement, Lender will make such loans to Borrower as from time to time
         Lender elects to make which are secured by Borrower's Collateral and
         the proceeds thereof. The aggregate unpaid principal of all such loans
         outstanding at any one time shall not exceed the lesser of (a) Four
         Hundred Fifty Thousand Dollars (U.S. $450,000.00) or (b) eighty percent
         (80%) of the unpaid face amount of (i) Qualified Accounts that are
         non-project Qualified Accounts and (ii) Qualified Accounts that are
         project Qualified Accounts, as defined below, (or such other
         percentages thereof as may from time to time be fixed by the Lender
         upon notice to Borrower), plus fifty percent (50%) of the cost or
         market value, whichever is lower, of all Eligible Inventory, as defined
         below, (hereinafter called
<PAGE>

         the "Inventory Value"), but in no event shall (A) Inventory Value be in
         excess of Three Hundred Thousand Dollars (U.S. $300,000.00) and (B)
         Inventory Value and Qualified Accounts that are project Qualified
         Accounts be in excess of Four Hundred Fifty Thousand Dollars (U.S.
         $450,000.00). The sum produced by applying at any given time the then
         prevailing percentages to the Inventory Value and to the total of
         Qualified Accounts is herein called the "Borrowing Base". All such
         loans shall bear interest, and where appropriate under the Lender's
         prevailing policy shall bear a service charge at the rate agreed on
         from time to time by the parties, and at the option of Lender shall be
         evidenced by notes in form satisfactory to Lender, but in the absence
         of notes shall be conclusively evidenced by the Lender's record of
         disbursements and repayments. The Borrower's loans are presently
         evidenced by that certain Secured Note ("Secured Note") bearing even
         date herewith. The unpaid principal balances of the Borrower's loans
         shall bear interest from the date hereof upon disbursed and unpaid
         principal balances (calculated on the basis of a year of 360 days) at a
         rate per annum which shall, from day to day, be equal to two and three
         quarters of one percent (2.75%) per annum for amounts outstanding under
         the Note, plus the rate for commercial loans announced from time to
         time in the United States as its prime rate ("Prime Rate") by Bank,
         each change in the rate to be charged hereon to become effective,
         without notice to the Borrower, on the effective date of each change in
         the Prime Rate, and interest shall be payable monthly in arrears on the
         1st day of each month, commencing on the 1st day of December, 2000. The
         Prime Rate is a reference rate and is not necessarily the lowest rate
         charged by Lender or Bank for extensions of credit. The Bank's Prime
         Rate is, as of the date hereof, nine and one-half of one percent
         (9.50%) per annum. All such loans shall be payable on demand or, if no
         demand then, on the Termination Date as that term is defined in the
         Secured Note."

         B. All references to the "Loan Agreement" set forth in the documents
executed in connection with the Loan Agreement shall be deemed to be references
to the Loan Agreement as amended by this Third Amendment.

         C. The Borrower represents and warrants that, as of the date hereof, it
is not in default of the terms of the Loan Agreement, as amended hereby, or any
of the other documents executed among the Borrower and the Lender in connection
therewith.

         D. This Third Amendment may be executed in any number of counterparts,
each of which when so executed and delivered shall be deemed an original.

         E. This Third Amendment and the Loan Agreement, as amended hereby,
shall be deemed to be contracts made under, and for all purposes shall be
construed in accordance with the laws of the State of New York.

                                      -2-
<PAGE>

         IN WITNESS WHEREOF, the Borrower and the Lender have caused this Third
Amendment to be executed under seal by their duly authorized corporate officers
all as of the day and year first above written.

                                     NDC AUTOMATION, INC.

                                     By /s/ Claude Imbleau
                                       -----------------------------------------

                                     Title  Chief Operating Officer
                                          --------------------------------------

                                     SUMMIT BUSINESS CAPITAL CORP.

                                     By /s/ Keith D. Scheid
                                       -----------------------------------------

                                     Title  Assistant Vice-President
                                          --------------------------------------

                                     By  /s/ W. Gregg Simpson
                                       -----------------------------------------

                                     Title  Vice President
                                          --------------------------------------

                                      -3-EXHIBIT 4.1

                              CONSULTING AGREEMENT

         This CONSULTING AGREEMENT ("Agreement") is entered into this 12th day
of November, 2000, by and between EREX, INC., a Nevada corporation (the
"Company"), and Jeffrey M. Harvey ("Consultant").

         1.       Engagement of Consultant. The Company hereby engages
                  Consultant to assist the Company in management services.

         2.       Compensation. As total and complete compensation for his
                  services provided herein, the Company shall issue to
                  Consultant 80,000 shares ("Shares") of the Company's
                  restricted common stock ("Stock"), par value $.001 per share
                  valued at the closing bid price of $.41 per share.

         3.       Expenses. Company shall assume and shall be responsible for
                  all expenses incurred by Consultant and shall be responsible
                  for all disbursements made in Consultant's activities. Except
                  as otherwise specifically authorized by the President of the
                  Company in advance, in writing, Consultant shall not incur on
                  behalf of Company, and Company shall not have, any liability
                  for any expenses, costs, and disbursements of Consultant.
                  Consultant shall indemnify and hold Company harmless from and
                  against any and all claims, actions, or liability for any
                  expenses, costs, and disbursements, including attorneys' fees,
                  of Consultant or its agents, servants, contractors, or
                  employees.

         4.       Term of Agreement. This Agreement shall commence on the date
                  first set forth above and shall continue in full force and
                  effect for a period of one (1) year. Either party, at its
                  option, may terminate this Agreement prior to the expiration
                  of such one (1)-year period by providing the other party
                  written notice of intent to terminate not less than thirty
                  (30) days prior to the effective date of termination.
                  Notwithstanding the foregoing, the Company may immediately
                  terminate this Agreement if Consultant materially breaches an
                  obligation hereunder.

         5.       Relationship of the Parties; Consultant's Limitations of
                  Authority. Consultant shall have no authority to bind Company
                  by any contract, representation, understanding, act, or deed
                  concerning Company. Except as otherwise specifically set forth
                  herein, neither the making of this Agreement nor the
                  performance of any part of the provisions hereof shall be
                  construed to constitute Consultant as an employee, agent or
                  representative of Company for any purpose, nor shall this
                  Agreement be deemed to establish a joint venture or
                  partnership. Consultant, in all respects, shall be deemed an
                  independent contractor with respect to the performance by
                  Consultant of its obligations hereunder.

         6.       Assignment. Neither this Agreement nor any of the duties or
                  obligations of Consultant herein may be voluntarily,
                  involuntarily, directly, or indirectly assigned, delegated, or
                  otherwise transferred or encumbered by Consultant without the
                  prior, written approval of the Company. Any such assignment,
                  delegation, transfer, or encumbrance without such approval
                  will be void and will constitute a "material breach" of this
                  Agreement entitling the Company to terminate this Agreement
                  immediately. A change in voting control of Consultant shall be
                  deemed an assignment of this Agreement. This Agreement is
                  fully assignable by the Company and shall inure to the benefit
                  of any assignee or other successor.

         7.       Miscellaneous Provisions.

                  7.1 Entire Agreement; Binding Effect. This Agreement
                  constitutes the entire agreement between the parties with
                  respect to the subject matter of this Agreement and supersedes
                  any prior agreements or understandings between the parties.
                  This Agreement shall be

<PAGE>

                  binding on and inure to the benefit of the parties hereto and
                  their respective successors and authorized assigns.

                  7.2. Modification. This Agreement may be modified only upon
                  the execution of a written agreement signed by both of the
                  parties.

                  7.3 Waivers. No failure on the part of either party hereto to
                  exercise, and no delay in exercising, any right, power, or
                  remedy hereunder shall operate as a waiver thereof nor shall
                  any single or partial exercise of any right, power, or remedy
                  hereunder preclude any other or further exercises thereof or
                  the exercise of any other right, power, or remedy.

                  7.4 Governing Law; Venue and Jurisdiction. This Agreement
                  shall be deemed to have been entered into in, and for all
                  purposes shall be governed by, the laws of the State of
                  Florida, without regard to Florida's choice of law decisions.
                  The parties agree that any action brought by either party
                  against the other in any court, whether federal or state,
                  shall be brought within Orange County, Florida, in the
                  applicable state and federal judicial districts and do hereby
                  waive all questions of personal jurisdiction or venue for the
                  purpose or carrying out this provision.

                  7.5 Attorneys' Fees. In the event of a dispute under this
                  Agreement, the non-prevailing party shall pay all of the
                  prevailing party's reasonable attorneys' fees and costs
                  incurred in connection with any such action, including
                  post-judgment collection proceedings.

                  7.6 Severability. In the event that any provision of this
                  Agreement, in whole or in part (or the application of any
                  provision to a specific situation), is held to be invalid or
                  unenforceable by the final judgment of a court of competent
                  jurisdiction after appeal or the time for appeal has expired,
                  such invalidity shall be limited to such specific provision or
                  portion thereof (or to such situation), and this Agreement
                  shall be construed and applied in such manner as to minimize
                  such unenforceability. This Agreement shall otherwise remain
                  in full force and effect.

                  7.7 Counterparts. This Agreement may be executed in two (2) or
                  more counterparts, each of which shall be deemed an original,
                  but all of which, taken together, shall constitute one and the
                  same instrument.

         In witness whereof, the parties hereto have executed this Agreement as
of the date and year first above written.

                                   "COMPANY"

                                   EREX, INC.

                                   By: /s/  Carl E. Dilley
                                      ------------------------------
                                       Carl E. Dilley, President

                                   "CONSULTANT"

                                   By: /s/  Jeffrey M. Harvey
                                      ------------------------------
                                       Jeffrey M. Harvey

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