Document:

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                                                                   EXHIBIT 10.35

SERVICE CHANGE ORDER TRANSMITTAL SHEET

ADDENDUM TO
SERVICE AGREEMENT FOR HP OPERATIONS SERVICES

CHANGE REQUEST CONTROL NUMBER:      56

INITIATED BY:                    HEWLETT PACKARD                 X    VIALINK
                           ------                             -------

SERVICE CHANGE ORDER DESCRIPTION:

Add two ISP infrastructure web connections and services to the existing
agreement titled "Service Level Agreement for Operations Services" dated June 3,
1999. This Change order will run concurrent with this agreement. This change
order will affect Exhibit A, Exhibit B, and Exhibit C and add a new Exhibit H to
the existing agreement.

PURPOSE OF CHANGE:

Provide the viaLink Company a High Availability ISP connection and certain
Managed Web Solutions herein.

DEPENDENCIES:

viaLink and HP Approval of this Change Order.

Approval of the Detailed Implementation plan by HP and viaLink.

COMMUNICATION PLAN:

See Detailed Implementation Plan.

PRE-CHANGE TESTING:

See Detailed Implementation Plan.

BACK OUT PLAN:

See Detailed Implementation Plan.

POST-CHANGE TESTING :

See Detailed Implementation Plan.

DOCUMENTATION CHANGE :

See Detailed Implementation Plan.

<PAGE>   2

RISK ANALYSIS:

See Detailed Implementation Plan.

PRIMARY HP CONTACT: Deborah Pittman/Allen McCoy

CONTACT/ REQUESTER: Gary Rowland

DATE OF REQUEST: 06/07/00

EFFECTIVE DATE OF SERVICE CHANGE:

         o        9/17/00 for ISP

SERVICE FEES TO BE ADDED IN EXHIBIT C:

BANDWIDTH SERVICE FEES PER LINE/MONTH.

<TABLE>
<S>                                                   <C>
0 to 3 Mbps                                            $ 4,500
3 to 4 Mbps                                            $ 5,400
4 to 5 Mbps                                            $ 6,300
5 to 6 Mbps                                            $ 7,200
6 to 7 Mbps                                            $ 8,000
7 to 8 Mbps                                            $ 8,700
8 to 9 Mbps                                            $ 9,200
9 to 10 Mbps                                           $14,500
10 to 15 Mbps                                          $17,500
15 to 20 Mbps                                          $23,000
</TABLE>

Based on 95% utilization measured on 5-minute intervals.

SERVICE ASSUMPTIONS:

Below is the ISP URL Availability which will become part of the functional
environment as stated in the Terms and Conditions section 12.3 for "Remedies and
Liabilities".

ISP URL Availability of 99.5%

TERM:

The services provided under this Service Change Order No. 56 will commence on
September 17, 2000 and continue concurrent with the initial term of the Service
Level Agreement as stated under Section 13.1 of the Agreement.

<PAGE>   3

TERMS AND CONDITIONS:

The Terms and Conditions of Sale Section 15.16 is modified to add "Exhibit H
Additional Terms and Conditions for Web Hosting Services". A copy of Exhibit H
is provided as an attachment to this Service Change Order No. 56.

AFFECTED EXHIBITS:

The affected exhibits are exhibit A the Statement of Work and exhibit C the
Service Fee Schedule. Below are the changes:

EXHIBIT A

Section 4.4.1 Reporting Activities Performed (Add to existing table)

<TABLE>
<CAPTION>
                REPORT                                DESCRIPTION                             FREQUENCY
                ------                                -----------                             ---------
<S>                                      <C>                                                  <C>
URL Availability                         The amount of time that                              Monthly
                                         the Web Monthly (URL) is available each
                                         month.

Bandwidth Utilization                    The amount of bandwidth that a                        Monthly
                                         viaLink is using on a monthly basis
</TABLE>

5.16 MANAGED BANDWIDTH SERVICE (NEW)

      HP will provide connectivity to the Internet for the managed web service.
      This service does not include Web Server Load Balancing or Web Caching.
      The connectivity is not intended to provide general Internet connectivity
      for the viaLink Company and is reserved for use by servers supported under
      this Service Level Agreement and needs related to that environment.

5.16.1   NETWORK ADDRESSING AND ROUTING (NEW)

            5.16.1.1 ACTIVITIES PERFORMED:

                      5.16.1.1.1 viaLink will provide IP addresses for Internet
                      facing network nodes

                      5.16.1.1.1 HP will provide routing to and from those
                      addresses and the Internet

            5.16.1.2 ADDITIONAL ROLES AND RESPONSIBILITIES:

                      5.16.1.2.1 HP will return IP addresses to viaLink upon
                      service termination

                      5.16.1.2.2 viaLink is responsible for assignment of all
                      non-HP owned addresses.

            5.16.1.3 EXCLUSIONS

                      5.16.1.3.1 HP does not support Network Address Translation
                      under this Agreement.

<PAGE>   4

5.17 BANDWIDTH PROVISIONING (NEW)

            5.17.1 ACTIVITIES PERFORMED

                      5.17.1.1 HP will provide a 100BaseT connection with
                              unfiltered and unrestricted Internet Access up to
                              viaLink's firewall.

            5.17.2 ADDITIONAL ROLES AND RESPONSIBILITIES

                      5.17.2.1 viaLink is responsible for any content, material,
                              message or data made available by viaLink or
                              transmitted by viaLink through the service.

5.18 INTERNET FAULT ISOLATION AND RESOLUTION (NEW)

            5.18.1 ACTIVITIES PERFORMED

                      5.18.1.1 HP will work to return a malfunctioning resource
                              to working order and/or to prevent it from failing
                              again, when an event has been detected with the
                              viaLink Internet connection or when viaLink
                              reports a problem.

                      5.18.1.2 HP will notify viaLink of the problem, and either
                              resolve the problem or work with the responsible
                              service providers to correct the failure.

                      5.18.1.3 HP will notify viaLink in writing of recommended
                              upgrades which HP in good faith believes are
                              reasonably necessary and will provide sufficient
                              detail regarding the reasons for the same.

            5.18.2 ADDITIONAL ROLES AND RESPONSIBILITIES

                      5.18.2.1 viaLink will advise HP within thirty days if it
                              agrees with the same. If the parties cannot agree
                              on such upgrades, HP, if it still believes the
                              upgrades are reasonably necessary, must follow the
                              Change Management Process regarding the same.

                      5.18.2.2 Subject to the Change Management Process set
                              forth in Section 7 of the Service Level Agreement,
                              HP is not responsible for degradation or
                              disruption of service attributable to viaLink's
                              decision(s) to decline recommended changes.
                              Notwithstanding anything to the contrary in the
                              Service Level Agreement, if and to the extent that
                              Section 7 of said Service Level Agreement
                              authorizes termination by HP based on a Service
                              Change Order concerning the services set forth in
                              this Service Change Order, such right to terminate
                              shall be limited to termination of this Service
                              Change Order only.

5.19 BANDWIDTH UTILIZATION DATA COLLECTION AND MEASUREMENT (NEW)

             HP will collect resource utilization information that can be
             analyzed by viaLink to understand how resources are performing,
             being utilized and how the use of these resources can be optimized.
             These utilization reports will be the basis for billing for
             bandwidth utilization.

            5.19.1 ACTIVITIES PERFORMED

                     5.19.1.1 HP will use its standard HP tool-set for data
                             collection of bandwidth utilization of the
                             dedicated viaLink switch.

                      5.19.1.2 HP will configure and implement data collection
                              tools for each monitored connection.

                      5.19.1.3 HP will monitor connection utilization with 5
                              minute sample intervals

<PAGE>   5

                      5.19.1.4 HP will base bandwidth billing on peak megabits
                              per second burst rates, discarding the top 5% of
                              the sample.

                      5.19.1.5 HP will adjust burst rate billing on a two-month
                              cycle.

                      5.19.1.6 HP will notify viaLink of billing change 30 days
                              in advance

                      5.19.1.7 HP will add or modify thresholds from the
                              performance data collection requirements as
                              requested by viaLink.

                      5.19.1.8 HP will adjust performance threshold values to a
                              reasonable level for ongoing problems after
                              consulting with viaLink.

                      5.19.1.9 HP will generate reports and deliver to viaLink
                              at least monthly.

            5.19.2 ADDITIONAL ROLES AND RESPONSIBILITIES

                     VIALINK

                     5.19.2.1 viaLink will provide target burst rate for the
                             first billing cycle according to a good faith
                             estimate of traffic levels

                     5.19.2.2 viaLink agrees that the second billing cycle will
                             be based upon the actual burst rates of the
                             previous measurement period.

                     JOINT

                     5.19.2.3 HP and viaLink will evaluate threshold values for
                             each resource or relationship of resources in
                             viaLink computing environment.

                     5.19.2.4 HP and viaLink will agree on the composition and
                             frequency of the performance data collection
                             requirements.

            11.1.1 REQUIRED TOOLS (THE FOLLOWING IS ADDED TO THE EXISTING TABLE)

<TABLE>
<CAPTION>
                 PURPOSE                 MANUFACTURER                   NAME                 HP        VIALINK
                 -------                 ------------                   ----                 --        -------
<S>                                   <C>                            <C>                     <C>       <C>
     Web Site Statistics              Web Trends Corp.               Web Trends              X
</TABLE>

EXHIBIT B

12.7 WEB (URL) AVAILABILITY (NEW)

            12.7.1 DEFINITIONS

                      12.7.1.1 "AVAILABILITY GOAL" -- The value identified as an
                              availability target for each specified Web (URL).

                       12.7.1.2 "WEB (URL) AVAILABILITY PERCENTAGE"-- The amount
                              of time that the Web (URL) was available This will
                              be calculated daily.

                      12.7.1.3 "PLANNED DOWNTIME" -- A Web (URL) outage which
                              has been planned in advance by HP.

                      12.7.1.4 "REPORTING PERIOD" -- The selected span of time
                              (at least one month) for calculating Web (URL)
                              Availability. Calculations are performed monthly.

                      12.7.1.5 "REVIEW MEETING" -- A formal meeting attended by
                              HP, viaLink , and any related third party
                              management (either by phone conference or in
                              person), in response to determination of
                              non-compliance with this Service Level Objective.

                      12.7.1.6 "WEB (URL) AVAILABILITY" --means that a defined
                              Web (URL) is accessible by viaLink users for
                              viewing. Web (URL) Availability does not relate to
                              the level of performance of viaLink Servers, but
                              is strictly a measure of availability for access
                              from the public Internet.

<PAGE>   6

                      12.7.1.7 "STABILIZATION PERIOD" -- The period from the
                              Effective Date of this Service Change Order until
                              such time as viaLink's Internet traffic is no
                              longer being directed through Intermedia or
                              viaLink's then current other ISP, but through HP's
                              infrastructure as set forth in this Service Change
                              Order.

                      12.7.1.8 "TOTAL DOWNTIME" -- The elapsed time between the
                              time the down event is initially detected or
                              determined to exist, and the time the Web (URL) is
                              determined to be accessible.

            12.7.2 URL AVAILABILITY

                      In each 24-hour period (local day) HP will monitor the URL
                      of the entry point to the Web Site (e.g. www.hp.com). If
                      the monitoring service detects that this site is not
                      available a log will be kept.

                      For each 24-hour period HP will compare the unavailable
                      record with the contracted availability service level. If
                      Web (URL) Availability is below the Service Level
                      Objective, HP will issue a Credit for the next month's
                      invoice of 1/30th (thirtieth) of the customers monthly
                      services invoice for the month in which the event
                      occurred. The service component of the monthly invoice
                      comprises systems management, network and applicable
                      security services; it does not include hardware or
                      software purchase or lease payments, maintenance contracts
                      or application support services delivered by any third
                      party.

12.8 WEB (URL) AVAILABILITY CALCULATION (NEW)

             HP will analyze the entry point (e.g. www.customer.com) Web (URL)
             Availability (data to determine the cause of the various outages
             that occur. Only Web (URL) Availability outages that fall within
             HP's responsibility as set forth in this Service Change Order will
             be subject to this objective.

             The following definitions and steps are used in determining Web
             (URL) Availability Percentages.

            12.8.1 DEFINITIONS

                      12.8.1.1 uh (UPTIME HOURS) represents the total number of
                              hours during the latest Reporting Period for which
                              the Web (URL) was accessible.

                      12.8.1.2 mah (MAXIMUM AVAILABLE HOURS) represents the
                              total number of hours during the latest Reporting
                              Period for which the Web (URL) could have been
                              accessible. Excluded from the maximum available
                              hours calculation will be:

                                12.8.1.2.1 Unplanned downtime due to resolution
                                          times of the 3rd party support
                                          providers; provided, however, that
                                          "3rd party support providers" as used
                                          in the foregoing does not include
                                          ISP's under contract with HP or anyone
                                          providing service or support to HP or
                                          such ISP's.

                                12.8.1.2.2 Unplanned downtime due to activities
                                          outside the control of HP; provided,
                                          however, that ISP's under contract
                                          with HP or anyone providing service
                                          or support to HP or such ISP's shall
                                          not be considered "outside the control
                                          of HP".

                                12.8.1.2.3 Except to the extent caused by HP,
                                          ISP's under contract with HP, or
                                          providers of service or support to
                                          either HP or such ISP's, unplanned
                                          downtime caused as the result of a
                                          problem for which HP has notified
                                          viaLink that downtime should be
                                          scheduled.

                      12.8.1.3 pdh (PLANNED DOWNTIME HOURS) represents the total
                              number of hours during the latest Reporting Period
                              for which the Web (URL) was planned to be
                              unavailable for activities such as maintenance,
                              updates, backups, etc.

<PAGE>   7

                      12.8.1.4 udh (UNPLANNED DOWNTIME HOURS) represents the
                              number of hours during the latest Reporting Period
                              that a WEB (URL) is determined to be inaccessible.

                      12.8.1.5 ap (AVAILABILITY PERCENTAGE) represents the
                              percentage of time, for the Web (URL) in the
                              latest Reporting Period, when the Web (URL) was
                              accessible.

            12.8.2 CALCULATIONS

                      12.8.2.1 Determine UPTIME HOURS (uh) for each Web (URL)
                                12.8.2.1.1 uh =(mah - pdh) - udh

                      12.8.2.2  Calculate AVAILABILITY PERCENTAGE (ap) for each
                                Web (URL) 12.8.2.2.1 ap = (uh/(mah - pdh)) * 100

            12.8.3 REPORTING

                      Web (URL) Availability reports will be produced for
                      viaLink and HP monthly and reviewed at the regularly
                      scheduled Account Review. The following information will
                      be included in the monthly reports:

                      12.8.3.1 The viaLink  Computing Environment.

                      12.8.3.2 Web (URL) Availability Percentage.

                      12.8.3.3 Planned Downtime hours.

                      12.8.3.4 Unplanned Downtime hours.

         EXHIBIT C

            13.2 SERVICE FEES

                     From Effective Date of this Service Change Order through
                     month 36

                     $95,000 Base environment (Existing Monthly Rate)

                     $ 9,000 2-ISP Network Connections (New)

                           (Estimated based 0 to 3 Mbps Utilization)
                           (Calculated Monthly based on Utilization for each ISP
                           Line)

                     $ 2,500 Startup cost per line for each additional line
                     below 9 Mbps. (New)

                     Startup up costs above 9Mbps will be custom pricing.

<TABLE>
<S>                                                                      <C>
                  0 to 3 Mbps                                            $ 4,500
                  3 to 4 Mbps                                            $ 5,400
                  4 to 5 Mbps                                            $ 6,300
                  5 to 6 Mbps                                            $ 7,200
                  6 to 7 Mbps                                            $ 8,000
                  7 to 8 Mbps                                            $ 8,700
                  8 to 9 Mbps                                            $ 9,200
                  9 to 10 Mbps                                           $14,500
                  10 to 15 Mbps                                          $17,500
                  15 to 20 Mbps                                          $23,000
</TABLE>

                  Based on 95% utilization measured on 5-minute intervals.

<PAGE>   8

         EXHIBIT H - ADDITIONAL TERMS AND CONDITIONS FOR WEB HOSTING SERVICES

1. USE OF SERVICES

         HP's obligation to provide the services is conditioned upon viaLink not
         using the services in a manner that is fraudulent or that violates
         applicable laws, regulations, court orders, tariffs, is "fraudulent",
         obscene or defamatory material, abuses or misuses of network resources
         or Internet. In the event HP determines that viaLink is in breach of
         the foregoing, HP shall immediately notify viaLink. If viaLink fails to
         cure such breach pursuant to the requirements of Article 13.3.2 in
         Section 1 Terms and Conditions of Sale, HP's right to terminate, to the
         extent available, shall be limited to the right to terminate this
         Service Change Order 56 only, in accordance with Article 13.3 under the
         Terms and Conditions of Sale section of the Agreement, and subject to
         the provision, upon viaLink's request, of continuing such services for
         up to ninety (90) additional days to enable viaLink to obtain
         alternative services provided the violation of the "use of service" is
         proven to HP to have been stopped. The foregoing right to terminate by
         HP shall not extend to any other services under the Service Level
         Agreement.

2. WARRANTY EXCLUSION

         Except as expressly provided elsewhere in the Agreement, HP is not
         responsible for the accuracy or quality of information obtained or data
         transmitted through its services as provided under this Service Change
         Order.

3. INDEMNIFICATION.

         Customer agrees to indemnify HP, its employees, agents, or
         subcontractors ("Indemnitee") against all claims, losses, liabilities
         and damages, judgments, awards, costs and expenses, including
         attorneys' fees, which Indemnitee may become liable to pay arising out
         of viaLink's breach of Section 1 (Use of Services) as stated above.

<PAGE>   9

This Service Change Order has been prepared pursuant to the Change Management
Procedures (Exhibit B) incorporated in the Service Agreement for HP Operations
Services between HP and viaLink dated June 3, 1999. Your signature below
indicates acceptance of this Service Change Order, and it also authorizes HP to
provide and invoice viaLink for these services according to the Service Fees
stated above.

IN WITNESS WHEREOF, HP and viaLink. Each acting with proper authority, have
caused this Service Change Order to be executed as of the date set forth below.

Hewlett-Packard Company                     The viaLink Company

Signature: /s/ ALLEN J. MCCOY               Signature:
          -------------------------                   --------------------------

Name: Allen McCoy                           Name:
     ------------------------------              -------------------------------

Title: Account Service Manager              Title:
      -----------------------------               ------------------------------

Date: 09/15/00                              Date:
     ------------------------------              -------------------------------<PAGE>   1

                                                                  EXHIBIT 10.22

                           Petroleum Helicopters, Inc.

                                 August 24, 2000

Mr. Lance F. Bospflug
2700 Lovers Lane
Ruston, LA  71270

Dear Lance:

     On behalf of Petroleum Helicopters, Inc. ("PHI"), I am pleased to confirm
PHI's offer of employment on the following terms and conditions, subject to
formal approval by the Compensation Committee of the Board of Directors and the
full Board.

     Your position will be President of PHI, and your employment will commence
as soon as practical. You will report to the Chairman of the Board and Chief
Executive Officer, Carroll W. Suggs, and the Board of Directors. Your starting
annual base salary will be $275,000. In addition, a recommendation will be made
to the Board's Compensation Committee that you be awarded upon commencing
employment 150,000 non-voting stock options and 20,000 shares of restricted
non-voting stock with a four year service vesting period in 25% increments
beginning at the end of one year. The options and restricted stock will
otherwise be on the same basis as PHI's most recently granted options and
restricted stock, except that the forfeiture provisions of 3.2(a) will not be
included and 3.2(b)(ii) will be limited to a materiality standard. You will also
be eligible to participate in PHI's Stock Incentive Plan, with annual awards, if
any are made to executives, commensurate with your position, and to participate
in PHI's Annual Incentive Plan ("AIP") which has a potential payout of 60% of
your base salary ( 1/2 in cash, 1/2 in restricted stock) based upon objectives
developed by you and the CEO and approved by the Compensation Committee.

     As an officer of PHI, you will be covered by the exculpation provisions of
its Articles of Incorporation, the indemnification provisions of its Articles
and Bylaws and its Directors and Officers Liability insurance policies.

     You will also receive a performance and salary review at the end of each
business year.

     As a result of your employment with PHI, you will be eligible to
participate in all current and future benefits programs available to PHI
executives generally, including PHI's health insurance, dental, 401(k), sick
leave, holidays, etc., the PHI Officers Deferred Compensation Plan, and the
Supplemental Executive Retirement Plan, but not including life insurance. With
respect to life insurance, PHI will reimburse you for up to $10,000 per year for
premiums paid by you on your personal life insurance currently in effect, plus
an amount necessary to cover income taxes on the reimbursement. You will be
immediately eligible for four (4) weeks of noncumulative vacation each year.
Club membership for business use, expense reimbursement for membership in
professional associations and related continuing professional education, company
vehicles for business use, and use of PHI aircraft will be provided to the
extent and on the same basis as provided to executives generally, although you
should be aware that some of these benefits are not provided at this time.

     Your location of employment will be Lafayette, Louisiana, but periodic
travel will be required to all PHI locations and to meet other requirements of
our business.

     PHI will pay reasonable closing costs on the sale of your home in Ruston,
Louisiana, and the purchase of a new residence in Lafayette, which includes real
estate fees and legal fees but excludes any item related to equity of your home,
loan origination points, or discount points. Costs associated with house hunting
trips and the movement of household to Lafayette and temporary living expenses
for up to 60 days or until you secure your new residence in Lafayette will also
be paid. In addition, PHI will pay you $20,000 as a non-accountable relocation
allowance.

     If during the first two years from your date of employment you are
terminated without cause or leave the Company for good reason, you will be
entitled to a lump sum payment of one year's annual base salary. Cause means
conviction of a crime, conduct materially damaging to PHI, or failure to perform
after being called upon to do so by a resolution adopted by the full Board. Good
reason means failure by PHI to honor this letter.

     After you have had a chance to review this offer, I would appreciate you
indicating acceptance by signing in the space provided below and returning this
letter to me as soon as possible, or contacting me with any questions or
comments.

                                   Sincerely,

                                   James W. McFarland
                                   Chairman
                                   Compensation Committee

JM/

ACCEPTED:

Signature:                                   Date:
          --------------------------------        --------------
                 Lance F. Bospflug

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