<PAGE>   1
                                                                   Exhibit 10.36

                      INFLOWNET(TM) INTERNET ACCESS SERVICE


                                    ADDENDUM
                                       TO
                         DATA CENTER SERVICES AGREEMENT


If attached to a valid Data Center Services Agreement or a valid Exhibit E,
Service Change Form, this ADDENDUM to the Data Center Services Agreement
("Addendum") is hereby added to and made a part of the Data Center Services
Agreement between Inflow, Inc. ("INFLOW") and customer identified below
("Customer") (the "Agreement") and is effective as the Effective Date of
Agreement or the Effective Date of the Exhibit E to which this Addendum is
attached. The Agreement and/or Exhibit E to the Agreement are incorporated by
reference and shall govern in the event of conflict between the Agreement and
this Addendum, unless this Addendum expressly states otherwise.


1. ABOUT THE SERVICE

         (a) InflowNet(TM) provides multi-based access to Internet service
provided through INFLOW and the Data Center, and includes the hardware and
software necessary to provide the physical connection to the Customer Equipment.

         (b) INFLOW will provide InflowNet(TM) as outlined in Exhibit A to the
Agreement ("InflowNet Services"), and the Inflownet (TM) Services will be
implemented pursuant tot he InflowNet(TM) Service Level Agreement provision
regarding installation, identified in Exhibit A-1 ("InflowNet(TM) Installation
Data"), subject to section 2 below.

         (c) InflowNet(TM) Services may include any or all of the following and
the specific services, and associated fees, selected by Customer under this
Addendum will be identified on an Exhibit A and/or Exhibit E to the Agreement.
These InflowNet(TM) Services selected by the Customer will be provided under the
terms and conditions identified herein and the applicable Service Level
Agreement provisions within Exhibit A-1, for the fees identified on the
applicable Exhibit A or E.

                  (i)      InflowNet(TM) MAX Services provide the customer with
                           two physical connections to the Customer Equipment,
                           access to the web-based tools, including, but not
                           limited to Customer bandwidth reports and the
                           InflowNet(TM) MAX Service Level Agreement described
                           in Exhibit A-1(A).

                  (ii)     InflowNet(TM) SX Services provide the customer with a
                           single physical connection to the Customer Equipment
                           and the InflowNet(TM) SX Services Level Agreement
                           described in Exhibit A-1(B).

                  (iii)    Dedicated and Flat-Rate Services: Dedicated and Flat
                           Rate Services provide the customer with a maximum
                           available level of bandwidth as set forth in Exhibit
                           A or E to the Agreement. The customer will be charged


                                  Addendum - 1
<PAGE>   2
                           the flat rate recurring fee set forth in an Exhibit A
                           or E to the Agreement regardless of the level of
                           usage.

                  (iv)     Usage Based Services: Usage based clients are
                           provided a maximum level of available bandwidth based
                           on a minimum recurring fee. Billing for InflowNet
                           customers who purchase Usage Based bandwidth will be
                           based on a per Mbps rate and actual average bandwidth
                           usage or the minimum monthly fee, whichever is
                           greater. Average bandwidth usage is calculated by
                           taking a sample of bandwidth usage every five (5)
                           minutes throughout the month and calculating the
                           average of all samples. The minimum monthly fee is
                           equal to 20% of the customer's maximum level of
                           available bandwidth, and will be identified on an
                           Exhibit A or E to the Agreement.

                  (v)      Domain Name Services: The Customer may elect to have
                           INFLOW provide Domain Name Services (DNS) for up to
                           10 Domain Names per customer. Thereafter, INFLOW will
                           charge the Customer a one-time setup fee for
                           providing Domain Name Services for each additional
                           Domain Name and may charge Customer for Domain Name
                           Services for sub-domains. These fees are not to be
                           confused with fees imposed by a Domain Registrar for
                           registration or maintenance of a Domain Name. Fees
                           imposed by the Domain Registrar are the
                           responsibility of the customer as outlined in section
                           3.5 of this addendum.

2. CUSTOMER INSTALLATION RESPONSIBILITIES

         (a) CUSTOMER ACKNOWLEDGES AND UNDERSTANDS THAT THE TIMELINESS AND
EFFECTIVENESS OF INFLOW'S INSTALLATION OF THE INFLOWNET(TM) SERVICE MAY BE
MATERIALLY AND SUBSTANTIALLY DELAYED IF CUSTOMER DOES NOT PROVIDE THE FOLLOWING
INFORMATION OR PERFORM THE FOLLOWING REQUIREMENTS TIMELY.

         (b) Customer is responsible for configuring its platforms or equipment,
including but not limited to, software, hardware, applications, and IP address
ranges, which are not part of Customer Equipment, if any, according to the
technical specifications provided by INFLOW in order to connect to INFLOW
equipment and the InflowNet(TM) Service ("Customer's External Equipment").

         (c) Customer shall timely provide the following information to INFLOW
prior to any anticipated InflowNet(TM) Installation Date:

                  (i)      Specifications on Customer's Equipment, applications,
                           and network to facilitate INFLOW's Installation and
                           provisioning of InflowNet(TM) Services, such
                           specifications may include, but are not limited to,
                           hardware applications, IP addresses, application
                           functionality, network configuration and network
                           architecture (collectively, "Specifications"); and


                                  Addendum - 2
<PAGE>   3
                  (ii)     Justification to support Customer's need for its
                           requested IP address space in accordance with the
                           Internet Registry (ARIN) and the guidelines following
                           RFC 2050.

         (d) Customer shall pay Installation Fees identified in an Exhibit A or
E to the Agreement within fifteen (15) calendar days after the InflowNet(TM)
Service InflowNet(TM) Installation Date.

3. CUSTOMER RECURRING RESPONSIBILITIES

         (a) CUSTOMER ACKNOWLEDGES AND UNDERSTANDS THAT THIS EFFECTIVENESS OF
THE INFLOWNET(TM) SERVICE MAY BE MATERIALLY AND SUBSTANTIALLY REDUCED IF A
CUSTOMER CONFIGURATION CHANGE IS IMPLEMENTED WITHOUT A CORRESPONDING REVIEW OF
AND/OR MODIFICATION TO THE INFLOWNET(TM) SERVICE.

         (b) For that reason, INFLOW requests that Customer provide written
advance notification of any and all material changes to Customer's Equipment,
application design and/or application functionality (collectively, "Customer
Configuration Changes") prior to the anticipated installation of such Changes to
allow INFLOW adequate time to implement any necessary modification(s) to the
InflowNet(TM) Service.

         (c) If Customer fails to provide adequate notification to INFLOW of
Customer Configuration Changes, Customer may be responsible for any and all
troubleshooting and repair INFLOW must conduct to modify, correct, or
reconfigure Customer's InflowNet(TM) Service and/or other Data Center Services.
Customer may be charged a repair rate for INFLOW's time and efforts.

         (d) Customer shall pay recurring fees for InflowNet(TM) Services in
accordance with the provisions of this Agreement.

         (e) Customer shall be responsible for the selection, purchase, and
maintenance of its own Domain Name(s). All fees associated with registration and
periodic maintenance of domain names are the Customer's responsibility and will
be billed directly to the Customer by the Domain Registrar. Such fees are not
included as part of the InflowNet Service fees and should not be confused with
any fees that INFLOW may charge for management of domain name services.

         (f) If Customer desires additional InflowNet(TM) Service or changes to
its existing InflowNet(TM) Service, Customer may contact the designated Account
Representative to explore whether such additions or changes are available. If
such additions or changes are available, INFLOW shall use reasonable efforts to
grant such requests subject to availability of facilities and Customer's
equipment, applications, and private network. Such addition or change, if
available, must be formally requested using the Service Change Forms at Exhibit
E to the Agreement and INFLOW will provide pricing estimates of such additions
or changes for Customer's approval prior to implementing such additions or
changes.


                                  Addendum - 3
<PAGE>   4
         (g) Customer shall at all times ensure that its content and users
adhere to the Acceptable Use Policy located at www.inflow.net./terms (URL") as
amended from time to time effective upon posting of the revised policy at the
URL. Notwithstanding anything to the contrary contained herein, INFLOW may
immediately take appropriate action, including disconnection or discontinuance
of Internet Services in the event of notice of possible violation by Customer of
the Acceptable Use Policy.

4. TERMS:

         (a) This Addendum commences as of the Effective Date and shall expire
with the Agreement, unless terminated earlier by either INFLOW or Customer,
under the termination provisions of Agreement.

5. CONFIDENTIAL AND PROPRIETARY INFORMATION:

         (a) In addition to the Confidential Information provisions of the
Agreement, Customer agrees and acknowledges that the components, configuration,
and method of providing InflowNet(TM) Service is highly proprietary to INFLOW,
and as such, are considered Confidential Information pursuant to Section 5
regarding Confidential Information within the Agreement. Unauthorized copying,
transfer or use may cause INFLOW irreparable injury that cannot be adequately
compensated by monetary damages.

6. RESTRICTIONS

         (a) Customer shall not and shall not permit others, including its
employees and agents, to reproduce, reverse-engineer, de-compile, disassemble,
alter, translate, modify, adapt, market, resell, sublease, or otherwise access
or use InflowNet(TM) Service, other than as specified in this Addendum. No
license is granted to Customer by this Addendum to use the InflowNet(TM) mark or
any intellectual property associated with InflowNet(TM) Service and no license
or right to any INFLOW software or hardware or equipment is transferred or
granted to Customer under this Addendum. If Customer, its employees, or agents,
or a third party on behalf of Customer, breaches this provision, INFLOW may
immediately terminate this Agreement without prior written notice and in
addition to any other rights and remedies available to INFLOW.

         (b) Except for IP Addresses expressly registered in the Customer's
name, all IP addresses shall remain, at all times, property of INFLOW and shall
be nontransferable and the Customer shall have no right to use such IP addresses
upon termination of or expiration of this addendum. IP addresses are allocated
by INFLOW to the customer per the Internet Registry (ARIN) and guidelines
following RFC 2050.

7. WARRANTIES AND DISCLAIMERS:

         (a) INFLOW's warranty for the InflowNet(TM) Service is set forth in
Exhibit A-1, Service Level Agreement ("SLA"), incorporated herein by reference,
except that INFLOW does not make, and hereby expressly disclaims, any warranty
on InflowNet(TM) Service if INFLOW's Equipment is installed, altered,
maintained, or repaired by anyone other than INFLOW or its Agents. INFLOW is not
responsible for any defects or damages to Customer Equipment or InflowNet(TM)
Service resulting from mishandling, abuse, misuse, accident, or Force Majeure,
or


                                  Addendum - 4
<PAGE>   5
from Customer's use of InflowNet(TM) Service in conjunction with equipment
electrically or mechanically incompatible with InflowNet(TM) Service or
equipment of inferior quality. Exhibit A-1 sets forth Customer's sole and
exclusive remedy for any failure of InflowNet(TM) Service.

         (b) Other than the Warranties addressed in this Addendum and in the
Agreement, and in addition to the disclaimer of warranties in the Agreement,
INFLOW does not make, and hereby disclaims, warranties, express or implied,
including but not limited to, warranties of merchantability, fitness for a
particular purpose, non-infringement and title, and any warranties arising from
a course of dealing, usage or trade practice and without limiting the generality
of the foregoing. INFLOW does not warrant that the InflowNet(TM) Service will
provide error-free, uninterruptable or secure service and protection from
unauthorized, unknown, or unforeseeable security breaches, accesses, or attacks
into or affecting Customer Equipment or systems. Further INFLOW does not make,
and hereby disclaims, any warranties, express or implied, that InflowNet(TM)
Service provides any form of real-time detection of any or all of the foregoing.



AGREED AND ACCEPTED AS OF _____________



<TABLE>
<S>                                     <C>
Inflow, Inc.                            CUSTOMER: High Speed Net Solutions, Inc.



By: /s/ Benjamin P. Griffith            By: /s/ Harris B. Glover
    ------------------------                --------------------
    (Authorized Signature)                  (Authorized Signature)

Name: Benjamin P. Griffith              Name: Harris B. Glover
Title: District Sales Manager           Title: Chief Technology Officer
Date: 9/19/00                           Date: 9/19/00
</TABLE>


                                  Addendum - 5
<PAGE>   6
                                 EXHIBIT A-1(A)

                                       TO
                   ADDENDUM TO DATA CENTER SERVICES AGREEMENT

                    INFLOWNET(TM) MAX INTERNET ACCESS SERVICE
                         SERVICE LEVEL AGREEMENT ("SLA")


This InflowNet ("InflowNet(TM) Services") Service Level Agreement ("SLA")
defines the performance criteria to which INFLOW will be held accountable, and
the reporting methods and compensation or remedies available to Customer in the
event that performance levels are not met. This SLA is incorporated by reference
into the InflowNet(TM) Service Addendum by and between Customer and INFLOW.

Should routine or non-routine, non-emergency maintenance or upgrades be
required, Customer will receive advance notice from INFLOW. Emergency
maintenance may be required without notice, in order to restore the
InflowNet(TM) Service performance or connectivity. Non-emergency maintenance
without prior notification to Customer is subject to this SLA.

This SLA provides no guarantee against failures of Customer Equipment, or
failures due to Force Majeure or other causes beyond INFLOW's control.

1. Availability

Performance Criteria: The Internet will be available to the Customer Equipment
100% of the time. "Availability" is defined as the ability to successfully
transmit data packets. "Internet Unavailability" consists of the number of
minutes that the Internet was not Available to the Customer Equipment, but will
not include unavailability continuing for an hour or less which Customer fails
to report to INFLOW within four days or any unavailability resulting from (a)
Network maintenance by INFLOW or by an internet backbone provider of which
Customer has received at least twelve (12) hours advance notice, (b) Customer's
applications, equipment, or facilities, (c) acts or omissions of Customer, or
any use or user of the service authorized by Customer or (d) reasons of Force
Majeure, as defined in the Data Center Services Agreement. In order to receive
the 100% Availability guarantee, the customer equipment must be connected to
both ports provided by INFLOW on the InflowNet distribution routers/switches.

Notification: INFLOW will use reasonable efforts to notify customer, via
telephone or e-mail or other immediately available mechanisms selected by
INFLOW, within fifteen (15) minutes after any Internet outage.

Reporting Methods: INFLOW will provide to Customer a report showing the start
time, stop time and duration of Internet outages no later than fifteen (15)
calendar days after the end of each month. The Internet availability rate for
any month will be calculated as a fraction, the numerator of which shall be the
total number of minutes in that month without Internet Unavailability and the
denominator of which shall be the total number of minutes in that month.

                               Exhibit A-1(A)-1
<PAGE>   7
Compensation: If INFLOW fails to meet this InflowNet Service Availability
performance criteria in any month, INFLOW will credit Customer's bill for
two-thirtieths (2/30) of the Customer's InflowNet recurring monthly fee for each
cumulative hour, or portion thereof, of Unavailability in that month, up to a
maximum of the Customer's contracted monthly service fees for InflowNet Service.

2. Installation

Performance Criteria: For the provision of 10 Mbps services or less, Customer's
InflowNet ports will be activated within thirty (30) calendar days of the date
the Agreement or Exhibit E is signed by INFLOW. For InflowNet Services above 10
Mbps, the InflowNet ports will be activated by the scheduled InflowNet(TM)
Installation Date provided in writing by the INFLOW Data Center General Manager,
subject to Customer's execution of the Data Center Services Agreement, or
Exhibit E to an existing Agreement, and the InflowNet Services Addendum.

Notification and Reporting: INFLOW tracks the installation time within the
Customer implementation schedule.

Compensation: In the event that INFLOW fails to meet the due date for port
activation INFLOW will credit Customer's bill in an amount equal to the
InflowNet access installation charges affected.

3. Performance

Performance Criteria: InflowNet provides internet connectivity at a rate of not
more than 40 milliseconds (ms) average roundtrip delay on the INFLOW Internet
Network. The inflow Internet Network starts with INFLOW's Internet connectivity
equipment, continues through the local connectivity, and ends at the first
available router of each ISP (BGP neighbor). An average roundtrip delay is
calculated over a 24-hour period beginning at 12:01 AM each day. INFLOW reserves
the right to remove an Internet Service Provider as BGB neighbor and re-route to
another BGB neighbor if the initial BGB neighbor is experiencing performance
issues that affect or may affect Customer's InflowNet Services performance. The
removal of and re-routing to another BGB neighbor will not be calculated within
the average roundtrip delay calculation described herein.

Reporting Methods: INFLOW provides a real-time report currently located at
www.inflow.net which displays roundtrip times to the first router in each of
INFLOW's ISP backbones. Please note the www.inflow.net URL is subject to changes
and INFLOW will provide adequate notice to Customer of such changes.

Compensation: If INFLOW fails to meet this InflowNet Service Performance
criteria, INFLOW will provide a credit against the InflowNet Service recurring
monthly fee on Customer's bill in an amount equal to the pro-rated charges for
one day of the InflowNet Service recurring monthly fee for each 24-hour day in
which the performance guarantee is not achieved.


                               Exhibit A-1(A) - 2
<PAGE>   8
           SECUREFLOW(TM) AND SECUREFLOW HIGH AVAILABILITY(TM) MANAGED
                                FIREWALL SERVICE


                                    ADDENDUM
                                       TO
                         DATA CENTER SERVICES AGREEMENT


If attached to a valid Data Center Service Agreement or a valid Exhibit E,
Service Charge Form, this ADDENDUM to the Data Center Services Agreement
("Addendum") is hereby added to and made a part of the Data Center Services
Agreement between Inflow, Inc. ("INFLOW") and customer identified below
("Customer") (the "Agreement") and is effective as of the Effective Date of
Agreement or the Effective Date of the Exhibit E to which this Addendum is
attached. The Agreement and/or Exhibit E to the Agreement are incorporated by
reference and shall govern in the event of conflict between the Agreement and
this Addendum, unless this Addendum expressly states otherwise.

1. ABOUT THE SERVICE

         1.1      SecureFlow(TM) and SecureFlow High Availability ("SecureFlow
                  HA")(TM) Managed Firewall Services provide perimeter
                  controlled access to Customer Equipment, monitor the
                  availability of the managed firewall, and provide escalation
                  procedures based on defined firewall alerts, subject to the
                  terms and conditions of this Addendum. SecureFlow(TM)
                  Services, as defined below, include the hardware and software
                  necessary for INFLOW to provide this service ("INFLOW
                  Equipment").

         1.2      INFLOW will provide either SecureFlow(TM) or Secure Flow
                  HA(TM) services as outlined in an Exhibit A or E to the
                  Agreement ("SecureFlow Services"), under the terms and
                  conditions identified herein and the applicable Service Level
                  Agreement provisions within Exhibit A-1, for the fees
                  identified on the applicable Exhibit A or E.

         1.3      SecureFlow(TM) Service provides the customer monitoring
                  systems for 24x7, redundant monitoring of the firewall's
                  status, a Checkpoint certified staff, a hot back-up spare to
                  every data center, and installation of vendor
                  patches/upgrades. The SecureFlow Service includes a 4-hour SLA
                  for repair of hardware, a 24-hour SLA for policy updates, and
                  a 100% satisfaction SLA, as more thoroughly explained in the
                  Service Level Agreement ("SLA") provisions applicable to
                  SecureFlow(TM) in Exhibit A-1.

         1.4      The SecureFlow HA(TM) Service adds to the SecureFlow Service
                  described above by providing a fully redundant architecture.
                  SecureFlow HA has two Nokia IP330 chassis linked in a
                  fail-over architecture. If one firewall should fail, the other
                  will immediately and seamlessly begin filtering traffic. In
                  addition to the SLAs described above, the SecureFlow HA
                  Service includes a 100% availability SLA,

                                  Addendum - 1
<PAGE>   9
                  as more thoroughly explained in the Service Level Agreement
                  provisions applicable to SecureFlow(TM) HA in Exhibit A-1.

         1.5      The SecureFlow Services will be installed within thirty days
                  of Customer's written notification to INFLOW that Customer's
                  Equipment is ready for installation of SecureFlow ("SecureFlow
                  Installation Date"), subject to section 2 below. The specific
                  INFLOW Equipment to be installed on Customer Equipment is
                  identified in Exhibit B-1.

         1.6      SecureFlow(TM) Services are not designed to, and therefore
                  cannot offer, (i) protection from external lines not passing
                  through the firewall device; (ii) protection from Customer's
                  internal employees, agents, applications, or systems; (iii)
                  real time monitoring of access, breech or attacks to Customer
                  Equipment or systems; and (iv) protection from deleterious
                  programming routines.

         1.7      INFLOW will monitor SecureFlow Services every twenty four
                  hours per day and seven days per week, subject to the
                  applicable Service Level Agreement terms attached at Exhibit
                  A-1.

         1.8      INFLOW will update the SecureFlow Services with vendor patches
                  and vendor upgrades, as such patches and upgrades become
                  reasonably available.

         1.9      INFLOW will provide, upon Customer's timely request, logs of
                  network traffic on Customer Equipment. Such logs are deleted
                  every seven days.

2. CUSTOMER INSTALLATION RESPONSIBILITIES

2. CUSTOMER ACKNOWLEDGES AND UNDERSTANDS THAT THE TIMELINES AND EFFECTIVENESS OF
   INFLOW'S INSTALLATION OF THE SECUREFLOW SERVICES MAY BE MATERIALLY AND
   SUBSTANTIALLY DELAYED IF CUSTOMER DOES NOT PROVIDE THE FOLLOWING INFORMATION
   OR PERFORM THE FOLLOWING REQUIREMENTS TIMELY.

         2.1      Customer shall timely provide the following information to
                  INFLOW prior to any anticipated Installation Date:

                  2.1.1    Specifications on Customer Equipment to facilitate
                           INFLOW's installation and provisioning of SecureFlow
                           Services, such specifications may include, but are
                           not limited to, hardware, appliances, IP addresses,
                           application functionality, traffic designations,
                           network configuration, and network architecture
                           (collectively, "Specifications"); and

                  2.1.2    Customer's designated "Firewall Policy," including
                           but not limited to traffic parameters, rule bases,
                           and traffic properties which will form the basis for
                           the SecureFlow Services. INFLOW reserves the right to
                           modify or reject any specific Firewall Policy
                           requirements that would impose an undue burden on
                           INFLOW's equipment, that is not legal, or that, in


                                  Addendum - 2
<PAGE>   10
                           INFLOW's opinion, may result in harm to INFLOW's
                           equipment, its Data Center, or to other INFLOW
                           customers or services.

         2.2      Customer shall timely perform the following prior to any
                  anticipated Installation Date:

                  2.2.1    Configure Customer platforms or equipment, including,
                           but not limited to, software, hardware, applications,
                           and IP address ranges, which are not part of Customer
                           Equipment, if any, according to the technical
                           specifications provided by INFLOW in order to connect
                           to INFLOW Equipment and the SecureFlow Services
                           ("Customer's External Equipment"); and

                  2.2.2    Provide reasonable access to Customer Equipment and
                           network to install SecureFlow Services; and

                  2.2.3    Pay Installation Fees identified in an Exhibit A or
                           E. Within fifteen (15) calendar days after the
                           SecureFlow Services Installation Date..

3. CUSTOMER RECURRING RESPONSIBILITIES

         3.1      CUSTOMER ACKNOWLEDGES AND UNDERSTANDS THAT THE EFFECTIVENESS
                  OF THE SECUREFLOW SERVICES MAY BE MATERIALLY AND SUBSTANTIALLY
                  REDUCED IF A CUSTOMER CONFIGURATION CHANGE IS IMPLEMENTED
                  WITHOUT A CORRESPONDING REVIEW OF AND/OR MODIFICATION TO THE
                  SECUREFLOW SERVICES.

         3.2      For that reason, INFLOW requests that Customer provide written
                  advance notification of any material changes to Customer
                  Equipment, Customer's External equipment, and/or
                  Specifications (collectively, "Customer Configuration
                  Changes") prior to the anticipated installation of such
                  Changes to allow INFLOW adequate time to implement any
                  necessary modification(s) to the SecureFlow Services.

         3.3      If customer fails to provide adequate notification to INFLOW
                  of Customer Configuration Changes, Customer may be responsible
                  for any and all trouble-shooting and repair INFLOW must
                  conduct to modify, correct, or reconfigure Customer's
                  SecureFlow Services and/or other Data Center Services.
                  Customer may be charged a repair rate for INFLOW's time and
                  efforts.

         3.4      Customer shall be responsible for the selection, purchase, and
                  administration of its own Domain Name(s).

         3.5      If Customer desires additional SecureFlow Services or changes
                  to its existing SecureFlow Services, Customer may contact its
                  designated Account Representative to explore whether such
                  additions or changes are available. If such additions or
                  changes are available, INFLOW shall use reasonable efforts to
                  grant such requests subject to availability of facilities and
                  Customer Equipment.


                                  Addendum - 3
<PAGE>   11
                  Such addition or change, if available must be formally
                  requested using the Service Change Form at Exhibit E to the
                  Agreement and INFLOW will provide pricing estimates of such
                  additions or changes for Customer's approval prior to
                  implementing such additions or changes.

         3.6      Customer may request up to two (2) changes to Customer's
                  Firewall Policy per month as no charge, pursuant to procedures
                  defined in the SecureFlow "Services Level Agreement" in
                  Exhibit A-1. Customer may request changes in to two per month
                  to the Firewall Policy and such changes will be implemented,
                  subject to facility or equipment availability, at a charge to
                  Customer.

         3.7      Customer shall pay recurring fees for SecureFlow Services in
                  accordance with the provisions of the Agreement.

         3.8      Within five business days of termination or expiration of this
                  Addendum, Customer shall return all INFLOW Equipment to INFLOW
                  and failure to timely return INFLOW Equipment shall be deemed
                  a default under the Agreement, if the Agreement is not
                  terminated or has not expired, subject to the default and
                  remedies provisions within the Agreement. If the Agreement is
                  terminated or expired, INFLOW shall have all remedies
                  available at law or in equity to recover INFLOW Equipment and
                  shall be entitled to recover its reasonable attorneys' fees
                  and other costs necessary to enforce this provision.

         3.9      Customer hereby grants to INFLOW a license to install,
                  maintain, use, operate, monitor, repair, and replace INFLOW
                  Equipment installed in Customer Area and/or on Customer
                  Equipment. Customer may not tamper with, disable, damage, or
                  otherwise modify INFLOW Equipment located within Customer's
                  Area and/or Customer Equipment.

4. TERM:

         4.1      This Addendum commences as of Effective Date and shall expire
                  with Agreement, unless terminated earlier by either INFLOW or
                  Customer, under the termination provisions of Agreement.

5. EMERGENCY CONTACTS:

         5.1      Customer shall designated in writing, emergency contacts,
                  including name, address, telephone, pager and/or e-mail
                  addresses, which will be the primary emergency contact to be
                  notified in the event of an emergency related to the
                  provisioning of SecureFlow Services under this Addendum.
                  Customer may modify its contact, address and other
                  notification methods periodically, with immediate notice of
                  such modification, in writing to INFLOW.

6. CONFIDENTIAL AND PROPRIETARY INFORMATION:

         6.1      In addition to the Confidential Information provisions of the
                  Agreement, Customer agrees and acknowledges that the
                  components, configuration, and


                                  Addendum - 4
<PAGE>   12
                  method of providing SecureFlow Services is highly proprietary
                  to INFLOW, and as such, are considered Confidential
                  Information pursuant to section 5 regarding Confidential
                  Information within the Agreement. Unauthorized copying,
                  transfer, or use may cause INFLOW irreparable injury that
                  cannot be adequately compensated by monetary damages.

7. RESTRICTIONS:

         7.1      Customer shall not and shall not permit others, including its
                  employees and agents, to reproduce, reverse-engineer,
                  de-compile, disassemble, alter, translate, modify, adapt,
                  market, resell, sublease, or otherwise access or use
                  SecureFlow Services, other than as specified in this Addendum.
                  No licensees is granted to Customer by this Addendum to use
                  the Secure(TM) mark or any intellectual property associated
                  with SecureFlow Services and no license or right to any INFLOW
                  software or hardware or equipment is transferred or granted to
                  Customer under this Addendum. If Customer, its employees, or
                  agents, or a third party on behalf of Customer, breeches this
                  provision, INFLOW may immediately terminate this Agreement
                  without prior written notice and in addition to any other
                  rights and remedies available to INFLOW.

8. WARRANTIES AND DISCLAIMERS:

         8.1      INFLOW's warranty for the SecureFlow Services is set forth in
                  Exhibit A-1, Service Level Agreement ("SLA"), incorporated
                  herein by reference, except that INFLOW does not make and
                  hereby expressly disclaims, any warranty on SecureFlow
                  Services if INFLOW's Equipment is installed, altered
                  maintained, or repaired by anyone other than INFLOW. INFLOW is
                  not responsible for any defects or damages to Customer
                  Equipment or SecureFlow Services resulting from mishandling,
                  abuse, misuse, accident, or Force Majeure, or from Customer's
                  use of SecureFlow Services in conjunction with equipment
                  electrically or mechanically incompatible with or of inferior
                  quality. Exhibit A-1 sets forth Customer's sole and exclusive
                  remedy for any failure of SecureFlow Services.

         8.2      Other than the Warranties addressed in this Addendum and in
                  the Agreement, and in additions to the disclaimer of
                  warranties in the Agreement, INFLOW does not make, and hereby
                  disclaims, warranties, express or implied, including but not
                  limited to warranties of merchantability, fitness for a
                  particular purpose, non-infringement and title, and any
                  warranties arising from a course of dealing, usage, or trade
                  practice. Without limiting the generality of the foregoing,
                  INFLOW does not warrant that the SecureFlow Services will
                  provide uninterrupted, error-free, or secure service and
                  protection from (a) viruses, Trojan horses, worms, time bombs,
                  cancelbots, or other harmful or deleterious programming
                  routines or (b) unauthorized, unknown, or unforeseeable
                  security breeches, accesses or attacks into or affecting
                  Customer Equipment or systems. Further INFLOW does not make,
                  and hereby disclaims, any warranties, express or implied that
                  SecureFlow Services provides any form of real-time detection
                  of any or all of the foregoing.


                                  Addendum - 5
<PAGE>   13
Signed and agreed to effective upon Effective Date set forth above:



FOR CUSTOMER:                              FOR INFLOW:
HIGH SPEED NET SOLUTIONS



/s/ Harris B. Glover                       By: /s/ Benjamin P. Griffith
--------------------------------               --------------------------
     (Authorized Signature)                      (Authorized Signature)



Harris B. Glover                           Benjamin P. Griffith
--------------------------------           ------------------------------
         Printed Name                               Printed Name



Chief Technology  Officer                  District Sales Manager
--------------------------------           ------------------------------
            Title                                      Title



9/19/00                                    9/19/00
--------------------------------           ------------------------------
            Date                                       Date




                                  Addendum - 6