Document:

EXHIBIT A

                              STAKE TECHNOLOGY LTD.

                             1999 STOCK OPTION PLAN

The purpose of the Stake Technology Ltd. 1999 Stock Option Plan (the "Plan") is
to have options available to grant to the employees, directors and consultants
of Sunrich Inc. and any other business interest that Stake Technology Ltd. may
acquire in the near term. Such a Plan is vital to ensure the long-term retention
of employees of Sunrich as well as employees, directors and consultants in any
other business interest that Stake may acquire in the future. Stock option plans
develop the interest and incentive of employees of the companies that Stake
Technology Ltd. (Stake) or its subsidiaries may acquire by providing them with
an opportunity to purchase common shares of the Company, thereby advancing the
interests of the Company and its shareholders. This Plan is exclusively for
employees, directors and consultants of Sunrich Inc. and employees in such
future business interests that Stake may acquire. No grants may be made from
this plan to current employees, directors or consultants who work for Stake
Technology Ltd.

Subject to shareholder approval, the 1999 Stock Option Plan was approved by the
Board of Directors (Board) of the Company, on February 18, 1999 at which time up
to 800,000 Common Shares of the Company were reserved for the Plan.

                                    The Plan

1.    Purpose of the Plan

      An option granted under the Plan provides an employee, director or
      consultant of Sunrich or a future company or business interest that Stake
      acquires with the opportunity to purchase common shares of the Company.

2.    Definitions

      In this Plan:

      "Date of Exercise" means the date upon which an Eligible Employee returns
      a completed Option purchase form to the Company together with payment in
      full for the number of Optioned Shares such employee, director or
      consultant is purchasing pursuant to such form;

      "Eligible Person" means an employee, director or consultant of Sunrich
      Inc. or any other company or business interest that Stake, its
      subsidiaries or affiliates have acquired at the time of the grant of an
      option;

      "Option" means the right granted under this Plan to an eligible employee
      to purchase a specified number of common shares of the Company pursuant to
      the provisions of the Plan;

      "Option Committee" means the committee chosen by the Board of the Company
      to administer the Plan;

      "Optionee" means a eligible employee of the Company who has been granted
      an Option pursuant to the Plan;

      "Option Period" means, unless otherwise provided by the Board of Directors
      of the Company, that period during which an Optionee granted an Option may
      purchase Optioned Shares commencing on the date approved by Shareholders
      and ending February 17, 2009.

      "Option Price" means the price per share at which an Optionee may purchase
      Optioned Shares; and,

      "Optioned Shares" means those Common Shares in respect of which an Option
      is granted to an Optionee under this Plan.
<PAGE>

3.    Eligibility

      This Plan is for exclusively for the employees, directors and consultants
      of Sunrich Inc. and any other company employees, directors and consultants
      of business interests that Stake or its subsidiaries or affiliates may
      acquire in the near future. The eligibility to participate in the Plan is
      at the discretion of the Board of the Company.

4.    The Number of Shares an Optionee is Entitled to Under the Plan

      The Option Committee shall determine the number of Optioned Shares in
      respect of which an Option is granted at the time of the grant of the
      Option.

5.    Purchase Price for Optioned Shares

      The purchase price of Optioned Shares comprised in an Option granted under
      the Plan shall be equal to 100% of the fair market of the common shares of
      the Company based on the closing price on the previous trading day of the
      grant date as determined by the Board of the Company at the time of the
      grant of the Option in accordance with the policies of any applicable
      regulatory authority.

6.    Exercise of Option

      Each Option granted under the Plan shall vest at such time or times as may
      be determined by the Board or the Option Committee and no rights under the
      Plan or any Option shall accrue to any Optionee in any Optioned Shares
      forming the subject matter of an Option prior to the vesting date of such
      Shares.

      The Option Committee will decide the vesting date of the Options granted
      to the Optionee under the Plan at the time of grant pursuant to Article 12
      hereof.

      The right of exercise shall be cumulative and any Optionee, if still an
      Employee of an eligible company, may exercise the Option in respect of any
      Optioned Shares which have vested at any time during the Option Period
      subject to the provisions of Articles 10 and 11 hereof.

      In order to purchase Optioned Shares under the Plan, an Optionee shall
      complete and execute an Option Exercise Form in the form of Schedule 1
      attached hereto and deliver it to the Company together with a certified
      cheque for the full purchase price of the Optioned Shares being acquired.

      Subject to the prior vesting of Optioned Shares and of restriction on
      purchase dates or as otherwise determined by the Option Committee, an
      Optionee can exercise all or any part of the Option at any time.

7.    Optionee Commitment

      An Optionee has no obligation to purchase any or all of the Optioned
      Shares at any time but, to the extent an Optionee exercises the Option,
      the full purchase price of the Optioned Shares purchased pursuant to such
      exercise must be paid in full as set out under "Exercise of Option" above.

8.    Share Certificates

     The Company will deliver a share certificate representing the Optioned
     Shares purchased pursuant to exercise of an Option as soon as reasonably
     possible after the exercise thereof.

                                       2
<PAGE>

9.    Transfer and Assignment

      No Option or any of the rights thereunder is assignable or transferable by
      an Optionee at any time during the Optionee's lifetime. Upon the exercise
      of an Option, the Optionee may sell or otherwise dispose of such shares in
      any manner that the Optionee wishes in any jurisdiction in which the same
      are qualified for sale and subject to any regulatory authority having
      jurisdiction over such sale.

10.   Termination for any Reason other than Death

      If an Optionee is terminated, resigns, or otherwise severs his or her
      relationship with the Company at any time before the end of the Option
      Period for any reason other than the death of such Optionee, such Optionee
      may, at any time during the 30 day period immediately next following the
      date of termination of employment, excluding the date of termination,
      purchase all or any part of the Optioned Shares which have vested in him
      or her and which he or she is entitled to purchase under the Option in the
      manner provided in the Plan. At 5:00 o'clock in the afternoon, local time,
      on such 30th day, if such day be a business day, such Option shall fully
      cease and determine and all rights of such Optionee thereunder shall
      cease, or, if such day shall not be a business day at 5:00 o'clock in the
      afternoon, local time, on the business day next following.

      If through the operation of Article 6 hereof, none of the Optioned Shares
      shall have vested in such Optionee, the provisions of Article 6 hereof
      shall prevail and such Optionee shall not be entitled to purchase any
      Optioned Shares notwithstanding the provisions of this Article.

      Transfer by the Optionee to a subsidiary of the Company or any other
      Company affiliated with it or from such subsidiary or affiliate to the
      Company shall be deemed not to be a termination of employment under this
      Article and all rights of the Optionee under such Option shall continue in
      full force and effect after such transfer.

11.   Termination by Reason of Death

      If any Optionee shall die at any time prior to the end of the Option
      Period and before such Optionee has purchased all of the Optioned Shares
      optioned to him or her, the exercise date with respect to any unexercised
      portion of an Option provided in Article 6 hereof will be accelerated and
      such Optionee's personal representatives may purchase all or any portion
      of the Optioned Shares of such deceased Optionee as provided in this Plan
      at any time during the shorter of the period of the Option Period or 180
      days immediately next following the death of the Optionee excluding the
      date of death if such day be a business day or, if such day shall not be a
      business day, on the business day next following.

12.   Administration of the Plan

      An Option Committee shall administer the Plan. The Option Committee has
      been delegated the authority by the Board of the Company to designate
      those employees, consultants and directors of Sunrich or future business
      interest that Stake may acquire in the near term who are to be granted
      Options in the Plan, the number of Optioned Shares to be granted to each
      such Optionee and otherwise to administer and interpret the Plan and the
      Options granted thereunder. The Board may amend, modify or terminate the
      Plan or any Option granted thereunder in respect of any Optioned Shares
      which shall not have become vested in an Optionee pursuant to the
      provisions of the Plan at any time without notice, but no such amendment,
      modification or termination shall divest any rights under any Option which
      shall have become vested in any Optionee.

      Any determination of the Option Committee shall be final and conclusive,
      unless the Board of the Company overrules any such determination, in which
      case the decision of the Board shall be final, conclusive and binding. The
      members of the Option Committee at the date hereof are as follows:

      Jeremy N. Kendall
      Cyril Ing
      Tim Bergqvist

      The Option Committee may delegate the day to day administration of the
      Plan to an officer of the Company.

                                       3
<PAGE>

13.   Changes Affecting Optioned Shares

      In the case of any reorganization or recapitalization of the Company (by
      reclassification of its outstanding capital stock), or its consolidation
      or merger with or into another corporation, or the sale, conveyance, lease
      or other transfer by the Company of all or substantially all of its
      property, pursuant to any of which events the then outstanding shares of
      the Company's capital are consolidated or subdivided, or are changed into
      or become exchangeable for other shares or stock, the Optionee, upon
      exercise of his or her Option, shall be entitled to receive in lieu of the
      Optioned Shares which he or she would otherwise have been entitled to
      receive upon such exercise and without any payment in addition to the
      Option Price therefor, the shares of stock which the Optionee would have
      received upon such reorganization, recapitalization, consolidation,
      subdivision, merger, sale or other transfer, if immediately prior thereto
      he or she had owned the Optioned Shares to which such exercise of the
      Option relates and had exchanged such Optioned Shares in accordance with
      the terms of such reorganization, recapitalization, consolidation,
      subdivision, merger, sale or other transfer.

      Notwithstanding the foregoing provisions of this Article 13, no adjustment
      provided for herein shall require the Company to deliver a fractional
      share under the Option.

14.   Employment

      The granting of an Option to any person under the Plan shall not confer
      any rights upon such Optionee other than those provided in the Plan and,
      without limiting the generality of the foregoing, shall not confer or be
      deemed to confer upon any such Optionee any right to continue as an
      employee, director or consultant of the Company, or any subsidiary or
      affiliate thereof.

15.   No Shareholder Right

      The granting of an Option pursuant to the Plan shall not confer any rights
      upon any Optionee as a shareholder of the Company, nor the right to
      receive notice of, attend nor vote at any meeting of shareholders of the
      Company until the exercise of an Option and such rights shall extend only
      to those number of Optioned Shares in respect of which the Option was
      exercised.

16.   Governing Law

      The Plan is established under the laws of the Province of Ontario and the
      rights of all parties and the construction and effect of each provision of
      the Plan shall be governed by the laws of the Province of Ontario; except
      in respect to any sale of any of the Common Shares in respect of which an
      Option has been exercised which shall be governed by the laws of the
      jurisdiction in which an Optionee proposes to sell such shares.

17.   Termination of the Plan

      The Plan will terminate on February 17, 2009 unless otherwise determined
      by the Option Committee unless all of the Options granted under the Plan
      are exercised, in which case the Plan will terminate on the date all of
      the Options granted under the Plan have been exercised.

IN WITNESS WHEREOF, subject to shareholder approval, the Company has executed
this Plan as of February 18, 1999.

STAKE TECHNOLOGY LTD.

J. N. Kendall, Chairman and      Leslie N. Markow, Vice President Finance, Chief
Chief Executive Officer          Financial Officer and Assistant Corporate
                                 Secretary

                                       4

<PAGE>

                                   SCHEDULE 1

                          To the STAKE TECHNOLOGY LTD.

                             1999 Stock Option Plan

To:     Stake Technology Ltd.

And to: American Stock Transfer and Trust Company

                              OPTION EXERCISE FORM

The undersigned hereby subscribes for _____________ Common Shares of Stake
Technology Ltd. (the "Company") which the undersigned is entitled to pursuant to
the provisions of the Stake Technology Ltd. 1999 Stock Option Plan.

I attach my cheque payable to the Company in the sum of $______________________,
representing the purchase price of the said Shares.

Dated at _________________________, this __________ day of ____________________,
19___.

Name:     _________________________     SIN: ___________________________________

Address:  _________________________     or

          _________________________     S.S.:___________________________________

          _________________________
                                        Signature:______________________________

Please call Leslie Markow - VP Finance at (905) 455-1990 x 110 if you wish to
exercise any of your options.

                                       5
<PAGE>

                                   EXHIBIT 25

                               POWERS OF ATTORNEY

<PAGE>

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                                      /s/ Leslie N. Markow
                                      ------------------------------------------
                                      Leslie N. Markow - Chief Financial Officer
                                      (Principal Accounting Officer)
<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                                      /s/ Cyril A. Ing
                                      ------------------------------------------
                                      Cyril A. Ing - Director and
                                      Corporate Secretary
<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                                      /s/ John D. Taylor
                                      ------------------------------------------
                                      John D. Taylor - Director and
                                      Chief Operating Officer

<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                                  /s/ Allan Routh
                                  ---------------
                             Allan Routh - Director

<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                               /s/ Joe Riz
                               -----------
                               Joe Riz - Director

<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                            /s/ Tim Bergqvist
                            -----------------
                            Tim Bergqvist - Director

<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                             /s/ Michael Boyd
                             ----------------
                             Michael Boyd - Director

<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                            /s/ Jim Rifenbergh
                            ------------------
                            Jim Rifenbergh - Director

<PAGE>

                                POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that the undersigned Director and/or Officer of
STAKE TECHNOLOGY LTD., a Canada corporation, (the "Corporation"), hereby
appoints Leslie N. Markow and Robert T. Lincoln and each of them, his attorneys
and agents to execute on his behalf and in his name and in capacity set forth
below, an Annual Report of the Corporation for the fiscal year ended December
31, 1999 on Form 10-KSB and any amendment thereto, for filing with the United
States Securities and Exchange Commission under the Securities Act of 1933, as
amended (the "Act"), and to do or cause to be done such other acts and to
execute such other documents which said attorneys and agents may deem necessary
or advisable to enable the Corporation to comply with the Act and any rules,
regulations or requirements of the Securities and Exchange Commission in respect
thereof.

Dated as of March 13, 2000

                    /s/ Jeremy N. Kendall
                    ---------------------
                    Jeremy N. Kendall - Chairman of the Board
                    and Chief Executive OfficerAT&T Corp.
                              295 North Maple Ave.
                             Basking Ridge, NJ 07920

                                  April 7, 1999

Cox Communications, Inc.
Cox @Home, Inc.
1400 Lake Hearn Drive, NE
Atlanta, GA 30319

At Home Corporation
425 Broadway Street
Redwood City, CA 94063

                  Re:  At Home Corporation Master Distribution Agreement Term
                       Sheet dated May 15, 1997 (the "MDA")

Gentlemen:

1.  Capitalized  terms used but not defined  herein  shall have the meanings set
forth in the MDA.

2.  In  consideration  of  the  agreement  of  AT&T  Corp.  ("AT&T")  and  Tele-
Communications,  Inc.  ("TCI" and  together  with AT&T,  the "AT&T  Parties") in
paragraph  3 below,  and subject to  approval  of a Fifth  Amended and  Restated
Certificate of  Incorporation  (the "Fifth  Certificate") of At Home Corporation
("@Home") in the form attached hereto as Exhibit A, each of Cox  Communications,
Inc. ("Cox") and Cox @Home,  Inc. ("Cox @Home," and  collectively  with Cox, the
"Cox Parties")  agrees that it will not, and it will not permit any other member
of the Cox Stockholder Group or any of their respective  Affiliates to, exercise
directly  or  indirectly  any  right  to  terminate  any  of  the  Cable  Parent
Exclusivity  Provisions  pursuant  to  Section  8 of the MDA as a result  of any
Performance  Default on the First Determination Date or any right to deliver any
notice with respect thereto or take or propose to take any action in furtherance
of, or with the effect of, the  foregoing.  For the avoidance of doubt,  nothing
herein  shall be deemed to preclude any Cox Party from  exercising  any right it
may have to terminate the Cable Parent Exclusivity  Provisions in the event that
there is a Performance Default on any Subsequent Determination Date.

3.  Subject to paragraph  4, in the event that on May 31,  2000,  the  aggregate
number of  Residential  Subscribers  of the AT&T  Parties  and their  respective
Affiliates  (the "AT&T Subs") is fewer than 277,000,  AT&T will deliver to Cox a
number of shares of Series A Common Stock,  $.01 par value,  of @Home ("Series A
Common  Stock")  equal to the product of (a) 10 and (b) the  excess,  if any, of
277,000 over the aggregate  number of AT&T Subs determined as of such date. Such
requirement to deliver shares of Series A Common Stock shall be  appropriately
<PAGE>

adjusted  for any stock splits or  combinations,  stock dividends,
recapitalizations or business combinations  occurring after the date hereof.  On
or prior to June 30, 2000,  AT&T shall  deliver to each of @Home and
Cox a certificate  setting forth the aggregate number of AT&T Subs as of May 31,
2000,  accompanied by a description  in reasonable  detail of the basis for such
calculation.  Within 10 business days after delivery of such certificate,  @Home
shall confirm such number of AT&T Subs as of May 31, 2000. In the event that any
shares are  required to be delivered  to Cox  pursuant to this  paragraph,  AT&T
shall deliver such shares within 15 business days following @Home's confirmation
of the  aggregate  number of AT&T Subs as of May 31,  2000.  In the event of any
disagreement with respect to such number of AT&T Subs, AT&T shall deliver to Cox
such number of shares,  if any,  as to which there is no dispute,  and within 15
business  days  @Home,  in  consultation  with AT&T and Cox,  shall  resolve the
disagreement as to the number of AT&T Subs as of May 31, 2000. In the absence of
manifest  error,  @Home's  resolution  shall be final and binding on the parties
and,  within  10  business  days  thereafter,  AT&T  shall  deliver  to Cox  any
additional  shares  that  may  be  deliverable  hereunder  based  on  the  final
determination  of the  number  of  AT&T  Subs  as of May 31,  2000.  All  shares
delivered  hereunder  shall  be  delivered  free  and  clear  of any  liens  and
encumbrances,  except as may arise by virtue of the Cox Parties being parties to
the  Stockholders  Agreement,  as amended,  or under federal or state securities
laws.

4. Notwithstanding  paragraph 3, AT&T shall not be required to deliver any
shares of Series A Common  Stock to Cox to the  extent  that the  failure of the
aggregate  number of AT&T Subs to equal at least 277,000 on May 31, 2000 results
from (a) any  problems  or  failures  in, or damages  to,  the  network or other
infrastructure  of @Home and its  Affiliates  (other than AT&T and its non-@Home
Affiliates),  (b)  interruptions  in service or any other  problems  or failures
relating to the delivery of the @Home  Services to the Point of  Demarcation  or
attributable  to software  provided by @Home, or (c) @Home's failure to meet its
current  performance  metrics.

5. In the event the Fifth  Certificate shall not
have been approved by the board and  stockholders of @Home and become  effective
on or before July 21,  1999,  either AT&T or Cox may  terminate  this  Agreement
(unless  the  Fifth  Certificate  shall  have  become  effective  prior  to such
termination),  in which  case this  Agreement  will be of no  further  force and
effect and the MDA will remain in effect as it existed prior to the date of this
Agreement,  as if this Agreement had never been  executed.  For the avoidance of
doubt,  in the event of such  termination,  the Cox Parties  will be entitled to
exercise such rights as they may have  pursuant to Section 8 of the MDA,  within
the time periods set forth therein,  as a result of any  Performance  Default on
the First Determination Date. In addition, in the event of such termination, the
Fifth  Certificate  will be  abandoned  and will not be filed with the  Delaware
Secretary of State or become  effective.

6. Each party hereto  hereby makes the following representations, warranties and
covenants to each of the other parties hereto:  (a) Such party has the legal
right and requisite power and authority to make and enter into this Agreement
and to perform its obligations  hereunder and to comply with the provisions
                                      -2-
<PAGE>

 hereof. The execution,  delivery and performance of this Agreement by
such party has been duly  authorized by all necessary  action on its part.  This
Agreement has been duly executed and delivered by such party and constitutes the
valid and binding obligation of such party enforceable  against it in accordance
with its terms.

(b) The execution, delivery and performance of this Agreement by such party, and
the  compliance by such party with the  provisions  hereof,  do not and will not
(with or without  notice or lapse of time, or both)  conflict with, or result in
any violation of, or default  under,  or give rise to any right of  termination,
cancellation  or  acceleration  of any obligation or the lessening of a material
benefit under, any loan or credit agreement,  note, bond,  mortgage,  indenture,
lease or other agreement,  instrument,  permit, concession,  franchise, license,
judgment,  order, decree, statute, law, ordinance, rule or regulation applicable
to such party or any of its  properties or assets  (excluding in the case of the
AT&T  Parties and the Cox  Parties,  the  properties  or assets of @Home and its
Subsidiaries),  other than any such conflicts,  violations,  defaults,  or other
effects which,  individually  or in the aggregate,  do not and will not prevent,
restrict  or  impede  such  party's  performance  of its  obligations  under and
compliance with the provisions of this Agreement.  If such party is an entity or
association,  the execution,  delivery and performance of this Agreement by such
party  does  not  and  will  not  contravene   the  charter,   bylaws  or  other
organizational documents of such party.

(c)  No  consent,   approval,   order  or  authorization  of,  or  registration,
declaration  or filing with,  any  governmental  or regulatory  authority or any
other Person (other than any of the  foregoing  which have been obtained and, at
the date in question,  are then in effect) is required  under existing laws as a
condition to the  execution,  delivery or  performance of this Agreement by such
party.  (d) Each  member of such  party's  Stockholder  Group and each  Ultimate
Parent and any Controlled  Affiliate thereof, in each case which owns securities
of the Company, is a signatory hereto.

7. Each party hereto  agrees not to issue any press  releases or otherwise  make
any public  statements with respect to the matters  contemplated  hereby without
the prior consent of the other party,  provided  however that any party may make
any such  disclosure if required by law,  provided  further  however that if any
such disclosure makes direct or indirect  reference to any other party hereto or
any of its Affiliates, the disclosing party shall, if practicable,  consult with
such other party prior to making such disclosure.

8. Except as otherwise expressly provided herein, neither this Agreement nor any
of the rights,  interests or obligations  hereunder  shall be assigned by any of
the parties hereto other than by operation of law in connection with a merger or
similar  business  combination  involving such party and except that each of the
Cox Parties and the AT&T  Parties may assign  their  rights  hereunder  to their
respective Affiliates;  provided that no such assignment shall relieve any party
of its  obligations  hereunder.  Subject to the foregoing,  this Agreement shall
inure to the  benefit  of and be  binding  upon the  parties  hereto  and  their
respective successors and permitted assigns.

                                      -3-
<PAGE>

9. Nothing in this Agreement,  whether express or implied, shall be construed to
give any Person,  other than the parties hereto,  any legal or equitable  right,
remedy or claim under or in respect of this Agreement.

10. This Agreement  shall be governed by, and construed in accordance  with, the
laws of the State of New York,  without  regard to the conflicts of law rules of
such State.

11. This  Agreement may be executed in two or more  counterparts,  each of which
shall be deemed an original and all of which together  shall  constitute one and
the same instrument.

12. If one or more  provisions of this  Agreement  are held to be  unenforceable
under applicable law,  portions of such provisions,  or such provisions in their
entirety, to the extent necessary, shall be severed from this Agreement, and the
balance of this Agreement shall be enforceable in accordance with its terms.

13. Any waiver, permit, consent or approval of any kind or character on the part
of any party of any breach or default under this Agreement, or any waiver on the
part of any party of any  provisions or conditions  of this  Agreement,  must be
made in writing and shall be effective only to the extent specifically set forth
in such writing. All remedies, either under this Agreement or otherwise afforded
to any party, shall be cumulative and not alternative.

14. Except as otherwise provided in this Agreement,  this Agreement contains the
entire  understanding  of the parties with respect to the subject  matter hereof
and supersedes all prior  agreements and  understandings  among the parties with
respect to the subject matter hereof.

15.  Without  intending  to limit the  remedies  available to any of the parties
hereto, each of the parties hereto acknowledges and agrees that a breach by such
party of any provision of this  Agreement  will cause the other  parties  hereto
irreparable  injury  for  which  an  adequate  remedy  at law is not  available.
Therefore,  the parties  hereto  agree that in the event of any such breach each
such party shall be entitled to an injunction,  restraining  order or other form
of equitable  relief from any court of competent  jurisdiction  restraining  any
other  party  hereto  from  committing  any breach or  threatened  breach of, or
otherwise  specifically  to enforce,  any such provision of this  Agreement,  in
addition to any other remedies that such parties may have at law or in equity.

16. Any  amendment  to this  Agreement  must be in writing and must be signed by
each of the parties  hereto;  provided  however any  amendment to paragraph 3 or
paragraph 4 hereof will be effective if a written  amendment thereto is executed
and delivered by each of Cox and AT&T.

                                      -4-
<PAGE>

17.  If the  foregoing  correctly  sets  forth  your  understanding,  please  so
     indicate  by signing  below.  Upon  execution  and  delivery  by all of the
     undersigned,  this  Agreement  shall  become a legal and binding  agreement
     among the parties hereto.

                                                  AT&T Corp.

                                                  By: ___________________

                                                  Tele-Communications, Inc.

                                                  By:____________________

Agreed and Accepted as of the date hereof:

Cox Communications, Inc.

By: ___________________

Cox @Home, Inc.

By: ___________________

At Home Corporation

By: ___________________

                                      -4-

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