Document:

<PAGE>
                                                                    Exhibit 4.15

                                  DEMAND NOTE
                                  -----------

$330,000.00
                                                                    May 10, 2001

FOR VALUE RECEIVED, AP HOLDINGS INC., a Delaware Corporation, (the "Borrower"),
hereby promises to pay to Facto Capital LLC (the "Lender"), or its successors or
assigns, the principal sum of Three Hundred Thirty Thousand  Dollars ($330,000)
on demand, and to pay interest on said principal amount, from the date hereof
until the payment of said principal amount, computed at a rate per annum which
shall be the Prime Lending Rate plus two and one-half percent (2.5%); provided
that if the Borrower fails to pay an amount of principal of, or interest on,
this Note when due, the Borrower agrees to pay interest on such overdue amount
at a rate per annum which shall be the Prime Lending Rate plus three and one-
half percent (3.5%).  Interest shall accrue from and including the date hereof
to the date of repayment thereof and shall be payable at the time of any
prepayment as provided below, on demand.  Interest will be computed on the basis
of a 360-day year of twelve 30-day months. For purposes of this Note, "Prime
Lending Rate" shall mean the rate of interest adopted by Christiania Bank OG
Kreditkasse ASA, acting through its New York branch from time to time as its
prime rate for extensions of credit in United States Dollars (which shall be a
base or reference rate and not necessarily the lowest rate offered by
Christiania Bank OG Kreditkasse ASA for commercial loans).  Each change in any
interest rate hereunder based on the Prime Lending Rate shall take effect when
and as the Prime Lending Rate changes.

          All payments of principal and interest on this Note shall be made in
United States Dollars.

          The Borrower may prepay the principal of this Note, without premium or
penalty, in whole, but not in part, upon 3 days' prior written notice to the
holder of this Note. Prepayment hereunder shall be accompanied by accrued and
unpaid interest on the principal amount of this Note to the date of prepayment.

          Should any action be instituted for the collection of this Note, the
reasonable costs and attorneys' fees therein of the holder shall be paid by the
Borrower.

          The terms of this Note are subject to amendment only in writing signed
by the Borrower and the Lender.

          The Borrower shall pay all reasonable out-of-pocket expenses incurred
by the Lender, including reasonable fees and disbursements of counsel for the
Lender in connection with this Note.
<PAGE>

          THIS NOTE SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE
INTERNAL LAWS OF THE STATE OF NEW YORK WITHOUT REGARD TO CONFLICTS OF LAWS
PRINCIPLES. Any judicial proceeding brought, or any dispute, arising out of this
Note or any matter related hereto may be brought in the courts of the State of
New York or in the United States District Court for the Southern District of New
York, and, by execution and delivery of this Note, the Borrower accepts the
jurisdiction of said courts, and irrevocably agrees to be bound by any judgment
rendered thereby in connection with this Note. The foregoing consent to
jurisdiction shall not be deemed to confer rights on any person other than the
respective parties to this Note.

                                       2
<PAGE>

          IN WITNESS WHEREOF, the Borrower has duly executed this Note as of the
date first written above.

                                       AP HOLDINGS, INC.

                                       By:     /s/  Gunnar Klintberg
                                              ----------------------
                                       Name:  Gunnar Klintberg
                                      Title:  Director and Vice President

                                                                               .

                                       3<PAGE>
                                                                    Exhibit 10.1

                              AMENDMENT NO. 1 TO
                     LIMITED WAIVER AND CONSENT AGREEMENT

     THIS AMENDMENT NO. 1 TO LIMITED WAIVER AND CONSENT AGREEMENT, dated as of
May 4, 2001 ("Amendment"), amends the Limited Waiver and Consent Agreement dated
as of January 25, 2000 (the "Waiver and Consent"), and is entered into among
Michael W. Ferro, Jr. (the "Seller"), Click Commerce, Inc., a Delaware
corporation formerly known as Click Interactive, Inc. (the "Company"), and
Compaq Computer Corporation, a Delaware corporation ("Compaq" and together with
the Company, the "Consenting Parties").

                                  WITNESSETH

     WHEREAS, the Seller and Consenting Parties entered into the Waiver and
Consent, which called for Compaq, along with certain other stockholders of the
Company, to enter into, among other provisions, the market stand-off provisions
set forth in Article IV to the Waiver and Consent;

     WHEREAS, the Seller and Consenting Parties desire to amend Section 4.4 of
the Waiver and Consent as provided herein; and

     WHEREAS, in consideration of Compaq's payments to the Company pursuant to
the terms of a Software License Purchase Agreement, of even date herewith, the
Company desires to grant a limited waiver of the market stand-off provisions set
forth in Section 4.4 of the Waiver and Consent in order for Compaq or its
affiliates (hereinafter also referred to as "Compaq") to commence an orderly
liquidation of a portion of the shares of the Company's common stock, par value
$0.001 per share ("Common Stock") that Compaq holds of record on the date
hereof; and

     WHEREAS, in light of the consideration recited above, the Board of
Directors of the Company has authorized this limited waiver of the market
stand-off provisions for bona fide business reasons;

     NOW, THEREFORE, in consideration of the premises and the other provisions
herein, the Seller and Consenting Parties hereto hereby agree as follows:

     1.1  Limited Waiver.  Notwithstanding the restrictions contained in
Section 4.4 of the Waiver and Consent, in consideration of the Compaq's payments
to the Company pursuant to the Software License Purchase Agreement, the Company
hereby agrees to waive the restrictions contained in Section 4.4 of the Waiver
and Consent with respect to the sale pursuant to Rule 144 ("Rule 144"), under
the Securities Act of 1933, as amended (the "Act") of an aggregate of 685,000
shares of Common Stock (the "Released Shares").

     2.1  Sale of Released Shares.  Effective on the date first above written,
for any of the Released Shares sold by Compaq pursuant to Rule 144, provided
that sales of the Released Shares satisfy all of the applicable requirements of
Rule 144, the Company shall consent to the sale of the Released Shares and shall
cooperate with the Company's transfer agent and selling brokers in order to
effectuate such sales pursuant to Rule 144. In connection with the sale of the

                                      S-1
<PAGE>

Released Shares pursuant to Rule 144, Compaq shall, from time to time, provide
the Company with customary representations and warranties typically provided by
sellers effecting sales under Rule 144, which representations and warranties are
reasonable satisfactory to legal counsel for the Company, and the Company shall
not require a separate written opinion of legal counsel of Compaq with respect
to such sales.

     3.1   Headings; Counterparts.  The various headings of this Amendment
are inserted for convenience only and shall not affect the meaning or
interpretation of this Amendment or any provisions hereof. This Amendment may be
signed in any number of separate counterparts, each of which shall be an
original, and all of which taken together shall constitute one instrument.

     3.2   Entire Agreement. This Amendment, together with the Waiver and
Consent and the Software License Purchase Agreement, constitute the entire
understanding among the parties hereto with respect to the subject matter hereof
and supersedes any prior agreements, written or oral, with respect thereto.
Except as amended by this Amendment, the Waiver and Consent shall remain in full
force and effect. This Amendment and the provisions contained herein may be
modified only by an instrument in writing executed by the Seller and the
Consenting Parties.

     3.3   Definitions.  Capitalized terms used herein but not otherwise
defined shall have the meaning ascribed to them in the Waiver and Consent.

IN WITNESS WHEREOF, the parties hereto have executed this Amendment as of the
day and year first above written.

                           [SIGNATURE PAGES FOLLOW]

                                      S-2
<PAGE>

                              SELLER:

                              /s/ Michael W. Ferro, Jr.
                              -------------------------
                              Michael W. Ferro, Jr., individually

                              CONSENTING PARTIES:

                              CLICK COMMERCE, INC.,
                              a Delaware Corporation

                              By:  /s/ Michael W. Ferro, Jr.
                                   --------------------------------------------
                                   Michael W. Ferro, Jr., Chairman and Chief
                                   Executive Officer

                              COMPAQ COMPUTER CORPORATION, a Delaware
                              corporation

                              By:     /s/ Jay Connor
                                      -----------------------------------------
                              Name:   Jay Connor
                              Title:  Vice President Professional Services
                                      Finance and Operation

                                      S-3

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00028-of-00352.parquet"}]]