Document:

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                                                               Exhibit 10.11

                              LINE OF CREDIT NOTE

$ 240,000.00                                                   January 29, 1990
                                                          Newton, Massachusetts

      FOR VALUE RECEIVED, Multitrak Software Development Corp., a Massachusetts
corporation with an address of, 180 Lincoln Street, Boston, MA, (the
"Borrower"), promises(s) to pay to the order of LRF Investments, Inc., (together
with any successor holder or holders of this Note, the "Lender") at 189 Wells
Avenue, #4, Newton, MA 02159, or such other place as Lender may designate, the
principal sum of Two Hundred Forty Thousand and no/00 Dollars ($240,000.00), or
so much thereof as shall be advanced hereunder, together with interest thereon,
as hereinafter set forth.

      Interest on the principal balance of this Note from time to time
outstanding shall accrue from the date hereof at a variable annual rate which
shall equal the "Prime Rate," as hereinafter defined, plus Three and One-Half
percentage points (3 1/2). Interest only shall be payable monthly in arrears on
the 15th day of each month beginning with the 15th day of February, 1990.
Interest shall be computed on the basis of a three hundred and sixty (360)-day
year and shall be paid for the actual number of days on which principal is
outstanding.

      This Note represents indebtedness for one or more advances of funds or
extensions of credit made by the Lender to the Borrower, upon request by the
Borrower and at the Lender's sole discretion.

      In any event, the entire outstanding principal balance of this Note,
together with any accrued interest as may be due hereunder, shall be paid on
demand.

      In the event that any payment due hereunder is not paid within fourteen
(14) days after the date it is due or upon a default under any instrument, if
any, executed by Borrower in connection with the loan evidenced by this Note
(together with this Note, the "Loan Documents") which default is not cured
within the applicable grace period, if any, Lender, at its option, may declare
immediately due and payable the entire outstanding balance of principal and
interest, together with all other charges to which Lender may be entitled.

      As used herein, the term Prime Rate shall mean the rate of interest
announced or published by the Wainwright Bank and Trust Co. from time to time as
its prime Rate. In the event that the Prime Rate changes, the interest rate
under this Note shall be adjusted to reflect any change in the Prime Rate as of
the date of such change.

<PAGE>

$240,000.00                                                          Demand Note

      Borrower agrees to pay all charges (including reasonable attorney's fees)
of Lender in connection with the collection and/or enforcement of this Note or
any other Loan Document, whither or not suit is brought against Borrower.

      The failure of Lender at any time to exercise any option or right
hereunder shall not constitute a waiver of Lender's right to exercise such
option or right at any other time.

      This Note shall be governed by, construed, and enforced in accordance with
the laws in the State of Massachusetts. If any provision of this Note is held to
be invalid or unenforceable by a court of competent jurisdiction, the other
provisions of this Note shall remain in full force and effect.

      This Note shall have the effect of an instrument under seal.

                                                  Multitrak Software
                                                  Development Corporation

                                                  By: /s/ Michael B. Shattow
                                                      -----------------------
                                               Michael B. Shattow, President

      The above-stated terms and conditions have been reviewed and are accepted
by the Lender as the date first set forth above.

                                                  LRF INVESTMENTS, INC.

                                                  By: /s/ Joseph J. Freeman
                                                      -----------------------
                                                Joseph J. Freeman, President<PAGE>
                                                                 Exhibit 10.12

                                                                  2-8223-2-(C)

                      MULTITRAK SOFTWARE DEVELOPMENT CORP.
                                      NOTE

$500,000                                                   Boston, Massachusetts
                                                               August 15, 1989

      FOR VALUE RECEIVED Multitrak Software Development Corp. (herein the
"Company"), a corporation organized and existing under the laws of the State of
Delaware with offices at 108 Lincoln Street Boston, Massachusetts 02111-2502,
hereby promises to pay to the order of LRF Investments, Inc. (herein "LRF") the
principal sum borrowed by Company from LRF under a letter agreement dated the
date of this Note (the "August 1989 Letter Agreement"). Said principal sum shall
not exceed Five Hundred Thousand ($500,000) Dollars and shall be paid as
follows. Interest on the average monthly unpaid balance of principal outstanding
shall be calculated at the end of each month at a rate per annum equal to the
average prevailing daily Prime Rate for such month as established from time to
time by Wainright Bank and Trust Company plus three and one-half (3 1/2%)
percent. Interest shall be paid in arrears at the close of business on the last
day of each month commencing on September 30, 1989, until this Note is paid in
full. Any unpaid principal balance on April 1, 1991 shall be paid in thirty six
(36) equal monthly payments of principal, which payments shall be made on the
last day of each month commencing on April 30, 1991.

      Principal, interest and all other amounts due under this Note shall be
payable in immediately available funds at the office of LRF Investments, Inc.,
189 Wells Avenue, Newton, Massachusetts 02159, or at such other place as the
holder of this Note may from time to time designate in writing to the Company.

      This Note is issued pursuant to and is entitled to benefits of the August
1989 Letter Agreement by and between the Company and LRF. Reference is hereby
made to the August 1989 Letter Agreement for a complete description of the
rights, obligations, limitations and restrictions of the Company and the holders
of this Note, and the terms and conditions of this Note set forth herein are
subject in every respect to the terms and conditions of the August 1989 Letter
Agreement.

      The Company shall have the option to prepay all or any part of the
principal amount of this Note from time to time together with interest accrued
on the amount prepaid to the prepayment date; provided however that no
prepayment, except a final payment, shall be in an amount of less than $1000.
<PAGE>

      This Note shall become immediately due and payable at the option of the
holder if any event of default occurs as hereinafter defined which remains
uncured after any applicable grace period relating thereto:

            1. It shall be an event of default if the Company shall be in
      default under the terms and conditions of a Security Purchase Agreement
      dated April 20, 1988 by and among the Company, LRF and Michael B. Shattow
      which event of default is not cured within any applicable grace period as
      provided in said Securities Purchase Agreement.

            2. It shall be an event of default if any payment to be made
      hereunder or pursuant to any other promissory note issued by the Company
      to LRF shall remain unpaid five (5) days after the due date for such
      payment and five (5) days after notice of such nonpayment is given by LRF
      to the Company.

      The Company hereby waives demand, presentment for payment, notice of
dishonor, protest, notice of protest and diligence, and agrees that the holder
hereof may extend the time for payment or accept partial payment without
discharging or releasing the Company.

      If after any default in the terms of this Note, the holder shall place
this Note with an attorney for collection, then, if permitted by law, the
undersigned agrees to pay all costs and expenses of such action including all
reasonable attorneys fees for the collection of this Note and the indebtedness
evidenced hereby.

      IN WITNESS WHEREOF this Note has been executed and delivered as a sealed
instrument at the place and on the date set forth above by the duly authorized
representative of the Company.

                                              Multitrak Software Development
                                              Corp.

                                              By: /s/ Michael B. Shattow
                                                  -----------------------------
                                                  Michael B. Shattow, President

[corporate seal]<PAGE>
                                                                Exhibit 10.13

      THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933
AND MAY NOT BE SOLD, TRANSFERRED, HYPOTHECATED OR OTHERWISE ASSIGNED EXCEPT (i)
PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT UNDER SUCH ACT OR (ii) FOLLOWING
RECEIPT BY THE ISSUER OF AN OPINION FROM ITS COUNSEL THAT NO REGISTRATION
STATEMENT IS NECESSARY IN CONNECTION WITH SUCH TRANSACTION. THE TRANSFER OF THIS
SECURITY IS SUBJECT TO THE CONDITIONS SPECIFIED IN THE SECURITIES PURCHASE
AGREEMENT, DATED APRIL 20, 1988, TO WHICH THE ISSUER AND THE ORIGINAL HOLDER OF
THIS SECURITY ARE PARTIES. A COPY OF SUCH CONDITIONS WILL BE FURNISHED BY THE
ISSUER TO THE HOLDER HEREOF UPON WRITTEN REQUEST AND WITHOUT CHARGE.

                      MULTITRAK SOFTWARE DEVELOPMENT CORP.
                               Subordinated Note

$160,000.00                                                Boston, Massachusetts
                                                           October 25, 1988

      FOR VALUE RECEIVED Multitrak Software Development Corp. (herein the
"Company"), a corporation organized and existing under the laws of the State of
Delaware with offices at 108 Lincoln Street, Boston, MA 02111-2502, hereby
promises to pay to the order of LRF Investments, Inc. the principal sum of ONE
HUNDRED AND SIXTY THOUSAND DOLLARS ($160,000.00) on April 30, 1991 together with
interest at a rate per annum equal to the Prime Rate established from time to
time by Wainright Bank and Trust Company plus three and one-half percent
(3 1/2%) (computed on the basis of a 360-day year of twelve 30-day months) on
the unpaid balance of principal hereof, payable in arrears at the close of
business on the last day of each month commencing on November 30, 1988, and on
any overdue principal and interest until paid in full.
<PAGE>

      Principal, interest and all other amounts due under this Note shall be
payable in immediately available funds at the office of LRF Investments, Inc.,
189 Wells Avenue, Newton, MA 02159, or at such other place as the holder of this
Note may from time to time designate in writing to the Company.

      This Note is issued pursuant to and is entitled to the benefits of, a
Securities Purchase Agreement (herein the "Agreement") dated April 20, 1988 by
and among the Company, the original purchaser hereof and Michael B. Shattow.
Reference is hereby made to the Agreement for a complete description of the
rights, obligations, limitations and restrictions of the Company and the holders
of the Note, and the terms and conditions of the Note noted hereafter are
subject in every respect to the terms and conditions of the Agreement.

      As provided in the Agreement, the Company shall have the option to prepay
all or any part of the principal amount of this Note from time to time together
with interest accrued on the amount prepaid to the prepayment date.

      Payment of the principal of, and interest on, this Note is expressly
subordinated to the prior payment of Senior Debt as provided in the Agreement,
and by acceptance of this Note the holder hereof agrees to be bound by such
provisions of the Agreement.

      If an Event of Default as defined in the Agreement should occur and be
continuing, the principal amount and accrued interest of this Note may be
declared immediately due and

                                       2
<PAGE>

payable in the manner and to the extent provided for in the Agreement.

      The Company hereby waives demand, presentment for payment, notice of
dishonor, protest, notice of protest and diligence, and agrees that the holder
hereof may extend the time for payment or accept partial payment without
discharging or releasing the Company.

      IN WITNESS WHEREOF this Note has been executed and delivered as a sealed
instrument at the place and on the date set forth above by the duly authorized
representatives of the Company.

                                               MULTITRAK SOFTWARE DEVELOPMENT
                                                 CORP.
[corporate seal]

                                               By /s/ Michael B. Shattow
                                                  ------------------------
                                                  Michael B. Shattow, President

ATTEST:

/s/ Peter Myerson,
------------------------------
Peter Myerson Assistant
  Secretary

DP-3679/d

                                       3

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