SUBLEASE           EXHIBIT NUMBER 10.34

     THIS SUBLEASE (the  "Sublease") is entered into as of the date set forth in
Section 1.1 (g) below,  by and between the  Sublandlord  and the  Subtenant  set
forth below.


                               W I T N E S S E T H

     1. SUBLEASE SUMMARY AND DEFINITIONS.

     1.1 The Sublease  provisions and  definitions set forth in this Section 1.1
in summary form are solely to facilitate convenient reference by the parties. If
there is any  conflict  between this  Section and any other  provisions  of this
Sublease, the latter shall control.

(a)   SUBLANDLORD'S NAME         TCSI CORPORATION
      AND ADDRESS:               1080 Marina Village Parkway
                                 Alameda, California 94501
                                 Attention: Chief Financial Officer

(b)   SUBLANDLORD'S STATE
      OF INCORPORATION:          NEVADA

(c)   SUBTENANT'S NAME           ei ViewStar, Inc.
      AND ADDRESS:               1080 Marina Village Parkway
                                 Alameda, California  94501
                                 Attn:  Chief Financial Officer

(d)   SUBTENANT'S STATE
      OF INCORPORATION:          Delaware

(e)   GUARANTOR'S NAME           eiStream, Inc.
      AND ADDRESS:               2911 Turtle Creek Blvd., Suite 1100
                                 Dallas, Texas  75219
                                 (See Article 5, herein.)

(f)   GUARANTOR'S STATE
      OF INCORPORATION:          Delaware

(g)   SUBLEASE DATE:             May 25, 2001

(h)   OVERSUBLANDLORD'S          COMPUTER ASSOCIATES INTERNATIONAL, INC.
      NAME AND ADDRESS:          1 Computer Associates Plaza
                                 Islandia, NY  11788-7000
                                 Attention:  Senior Vice President - Facilities

(i)   OVERSUBLEASE:              Sublease dated July 12, 1996, between
                                 Sublandlord and Oversublandlord.


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(j)   OVERLANDLORD'S             MARINA VILLAGE PROPERTY MANAGEMENT
      NAME AND ADDRESS:          1150 Marina Village Parkway, Suite 100
                                 Alameda, CA 94501
                                 Attention:Peter Edelen

(k)   OVERLEASE:                 Lease dated June 25, 1992, between Overlandlord
                                 and Oversublandlord, as amended by Amendment
                                 No. 1, dated January 29, 1993, and Amendment
                                 No. 2, dated December 1, 1994.

(l)   PREMISES:                  Approximately 18,463 rentable square feet on
                                 the third floor of 1080 Marina Village Parkway,
                                 Alameda, California described in Exhibit "A,"
                                 hereto (the "Premises). Prior to the Sublease
                                 Commencement Date, Sublandlord and Subtenant
                                 shall cause the Premises to be measured to
                                 determine the rentable square feet of the
                                 Premises (the "Rentable Square Footage") under
                                 the American National Standard Method for
                                 Measuring Floor Area in Office Buildings,
                                 ANSIZ65.1--1980 (reaffirmed 1989) or successor
                                 standard(s), adopted by the Building Owners and
                                 Managers Association International.

(m)   SUBLEASE  COMMENCEMENT     June 1, 2001, or upon approval by Over-Landlord
      DATE:                      or OverSublandlord, whichever is later. (See
                                 Article 3, herein.)

(n)   SUBLEASE EXPIRATION DATE:  September 30, 2004

(o)   BASE MONTHLY RENT:         The initial Base Monthly Rent (the "Initial
                                 Base Monthly Rent") shall be an amount arrived
                                 at by multiplying the Rentable Square Footage
                                 by Two Dollars and Twenty-five cents ($2.25)
                                 (full service).

(p)   FREE RENT:                 Sublandlord will provide Subtenant the first
                                 four (4) months' occupancy free of rent.

(q)   EARLY ACCESS:              Sublandlord will grant Subtenant early access
                                 to the Premises upon execution of the Sublease
                                 agreement by Subtenant and Sublandlord, and
                                 Sublandlord will no longer


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                                 show the Premises to any other party.

(r)   OPERATING EXPENSES/TAXES:  Subtenant will be responsible for paying
                                 operating expenses over the Base Year.

(s)   SECURITY DEPOSIT:          A sum equal to three (3) months of average
                                 monthly rent upon a fully executed lease
                                 agreement.

(t)   ALTERATIONS:               (See Article 8, herein.)

(u)   BASE YEAR:                 January 1 - December 31, 2001

(v)   BROKERS:
      For SUBLANDLORD:           AEGIS REALTY PARTNERS

      For SUBTENANT:             JONES LANG LASALLE

(w)   SUBTENANT'S PROPORTIONAL
      SHARE:                     20.685%

(x)   BUILDING:                  The "Building" is that certain office building
                                 commonly known as 1080 Marina Village Parkway,
                                 Alameda, California.


2. SUBLEASE GRANT.

     2.1. By lease (hereinafter referred to as the "Overlease") described above,
the Overlandlord  leased to Oversublandlord  the Premises in accordance with the
terms of the Overlease.  A copy of the Overlease has been received by Subtenant.
By Sublease (hereinafter referred to as the "Oversublease"), the Oversublandlord
leased  to  Sublandlord  the  Premises  in  accordance  with  the  terms  of the
Oversublease. A copy of the Oversublease has been received by Subtenant.

     2.2. In  consideration of the obligation of Subtenant to pay rent as herein
provided and in  consideration  of the other  terms,  covenants  and  conditions
hereof,  Sublandlord hereby leases to Subtenant and Subtenant hereby leases from
Sublandlord,   upon  and  subject  to  the  provisions  of  this  Sublease,  the
Oversublease and the Overlease, the Premises.

     3. SUBLEASE TERM.

     3.1. Subject to the other provisions  hereof,  this Sublease shall continue
in full force and effect for a term beginning on the Sublease  Commencement Date
and ending on the Sublease Expiration Date as defined above. Such term is herein
called the "Sublease Term."


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     3.2. The Sublease  Commencement  Date shall be date as set forth in Section
1.1(m).  If for any reason there is a delay in the Sublease  Commencement  Date,
Sublandlord  shall not be subject  to any  liability  therefore,  nor shall such
failure  affect the validity of this Sublease,  or the  obligations of Subtenant
hereunder,  or extend the term hereof,  provided,  however, that if the Sublease
Commencement  Date is not on or before July 1, 2001,  Subtenant may, in its sole
discretion, terminate this Sublease.

     3.3.  Sublandlord  will grant  Subtenant  early access to the Premises upon
execution  of  the  sublease   agreement  by  Subtenant  and  Sublandlord,   and
Sublandlord will no longer show the Premises to any other party.

     4. RENT.

     4.1.  Subtenant,  in  consideration  of  this  Sublease,  agrees  to pay to
Sublandlord  as rent (the "Base Monthly  Rent") the amounts set forth in Section
1.1,  hereof.  Base  Monthly Rent is payable in advance and without  demand,  at
Sublandlord's  office (or such other location as Sublandlord  shall designate in
writing) by check, in monthly  installments on the first (1st) day of each month
during the Sublease  Term without any set-off,  off-set,  abatement or reduction
whatsoever.  Subtenant's  failure to receive an invoice from Sublandlord for the
rent  shall  not  relieve  Subtenant  from  its  obligation  of  timely  payment
hereunder.  In the event the Sublease Commencement Date is after the first (1st)
day of the month, Subtenant shall be entitled to a prorated credit for each such
day after the first (1st) day of the month to be applied toward the next month's
payment.

     4.2.  Effective  June 1 of  each  calendar  year,  following  the  Sublease
Commencement  Date,  of the  Sublease  Term,  the  Base  Monthly  Rent  shall be
increased by multiplying  the Base Monthly Rent in effect during the immediately
preceding  calendar  month by a fraction,  the numerator of which is one hundred
four (104) and the denominator of which is one hundred (100).

     4.3. As used in this Sublease, "Rent" shall mean the Base Monthly Rent, the
Operating  Expense  reimbursements  pursuant to Sections 1.1 and Article 14, and
all other  monetary  obligations  provided  for in this  Sublease  to be paid by
Subtenant, all of which constitute rental in consideration for this Sublease.

     4.4.  In the event the Rent is not paid by the fifth (5th) day of any given
month,  interest  shall accrue  thereon at the maximum rate permitted by law. In
addition,  if the rent is not paid by the tenth  (10th) day of any given  month,
Subtenant shall pay to Sublandlord, as liquidated damages, and not as a penalty,
an additional amount equal to five percent (5%) of the rent that is due, but not
less than One Hundred Dollars ($100.00).

     4.5. Anything  contained in any provisions of this Sublease to the contrary
notwithstanding,  in  consideration  of Subtenant  paying the  security  deposit
pursuant to Section  1.1,  and no Base  Monthly Rent shall be owing for the four
months June, July,  August and September 2001 , Base Monthly Rent shall Commence
on October 1, 2001.


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     5. GUARANTEE TO SUBLANDLORD.

     5.1 In order to induce  Sublandlord  to enter into the  Sublease  agreement
with Subtenant,  Guarantor  hereby  unconditionally  and irrevocably  guarantees
payment and  performance by the Subtenant,  when due, of all of its  obligations
under the  Sublease.  If Subtenant  during the term of the Sublease  files for a
stay of  relief  in  United  States  Bankruptcy  Court,  Guarantor  shall pay to
Sublandlord any pre-petition and/or post-petition amounts that otherwise are due
and not paid to Sublandlord by Subtenant.

     6. ASSIGNMENT OF SUBLETTING.

     6.1 Sublandlord  and Subtenant  hereby adopt the provisions of Section 6 of
the  Oversublease  with respect to  assignment  and  subleasing of the Premises.
Notwithstanding  the foregoing,  any assignment or subleasing by Subtenant shall
be expressly conditioned upon the receipt of consent by the Oversublandlord.

     7. TERMS OF THE OVERLEASE AND OVERSUBLEASE.

     7.1.  Except as herein  otherwise  expressly  provided,  and except for the
obligation  to pay  rent  and  additional  rent  under  the  Overlease  and  the
Oversublease  (collectively,  the  "Overleases"),  all of the terms,  covenants,
conditions and provisions in the Overleases are hereby incorporated in, and made
a part of, this  Sublease,  and such rights and  obligations as are contained in
the  Overleases  are hereby  imposed upon the  respective  parties  hereto;  the
Sublandlord  herein being  substituted for the landlords in the Overleases,  and
the Subtenant herein being  substituted for the tenants named in the Overleases;
provided,  however,  that the  Sublandlord  herein  shall not be liable  for any
defaults by Overlandlord or Oversublandlord. Neither Sublandlord nor Sublandlord
nor  Subtenant  shall take any action  that shall cause there to occur a default
under the terms of the Overleases (or either of them),  nor shall either fail to
take any action the failure of which shall cause there to occur such default. If
the Overleases (or either of them), nor shall either fail to take any action the
failure of which shall cause there to occur such default.  If the Overleases (or
either of them) shall be terminated for any reason during the term hereof,  then
and in that event this  Sublease  shall  thereupon  automatically  terminate and
Sublandlord  shall have no liability to  Subtenant by reason  thereof.  Upon the
termination of this Sublease, whether by forfeiture, lapse of time or otherwise,
or upon the  termination of Subtenant's  right to possession,  Subtenant will at
once  surrender  and  deliver up the  Premises  in good  condition  and  repair,
reasonable  wear and tear  excepted.  Sublandlord  and Subtenant  shall promptly
deliver  to the other any and all  notices  received  from the  Overlandlord  or
Oversublandlord  or their agents that affect the other's  rights or  obligations
under the Overleases (or either of them) or this Sublease.

     7.2.  This  Sublease is subject to, and  Subtenant  accepts  this  Sublease
subject to, any  amendments and  supplements  to the  Overleases  hereafter made
between the parties  thereto,  provided that any such amendment or supplement to
the Overleases (or either of them) will not prevent or adversely  affect the use
by  Subtenant  of the Premises in  accordance  with the terms of this  Sublease,
increase the obligations of Subtenant or decrease its rights under the Sublease,
or in any other way materially adversely affect Subtenant.


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     7.3. This Sublease is subject and  subordinate to the Overleases and to all
ground or  underlying  leases  and to all  mortgages  that may now or  hereafter
affect such leases or the real  property of which the Premises  are a part,  and
all  renewals,  modifications,   replacements  and  extensions  of  any  of  the
foregoing.  This Section 7.3 shall be self-operative,  and no further instrument
of subordination  shall be required.  To confirm such  subordination,  Subtenant
shall execute promptly any certificate that Sublandlord may request.

     8. CONDITION OF PREMISES.

     8.1.  Subtenant  agrees to take the Premises "as is."  Notwithstanding  the
foregoing,  if a duly  authorized  regulatory  authority  or court of  competent
jurisdiction  shall hereafter  determine that the Premises  violate the terms of
the Americans With Disabilities Act (the "ADA"), and that such violation existed
prior to the Sublease  Commencement Date, then the cost of abating the violation
shall be borne by Sublandlord; provided, further, that if such violation results
from any  alteration  or  improvement  of the  Premises  performed  by or at the
direction of Subtenant, then the cost of abating the violation shall be borne by
Subtenant.

     9. USE OF PREMISES.

     9.1 Subtenant agrees that the Premises shall be occupied only as executive,
administrative and general offices for Subtenant's business.

     10. CONSENT OF OVERLANDLORD AND OVERSUBLANDLORD.

     10.1 This Sublease is conditioned  upon the consent thereto by Overlandlord
and the Oversublandlord (collectively, the "Overlandlords"), which consent shall
be evidenced by Overlandlords'  signatures  appended hereto or separate consents
in the form utilized by  Overlandlords  for such  purposes.  Subtenant  shall be
solely  responsible  for  any  fees  or  charges  imposed  by  Overlandlords  in
connection with the obtaining of such consent.  Provided  Overlandlords' consent
does  not  materially  affect  the  terms  of  this  Sublease,  Subtenant  shall
immediately  execute any documents requested by Overlandlords in order to obtain
Overlandlords'  approval;  and, in the event such  documents  are not signed and
returned by Subtenant within five (5) days of receipt, Subtenant hereby appoints
Sublandlord as its attorney-in-fact  and authorizes  Sublandlord to execute same
on Subtenant's behalf.

     10.2  Sublandlord  makes  no  representation   with  respect  to  obtaining
Overlandlords'  approval of this Sublease  and, in the event that  Overlandlords
(or either of them) notify  Sublandlord that  Overlandlords  (or either of them)
will not give such  approval,  Sublandlord  will so notify  Subtenant  and, upon
receipt of such  notification by Sublandlord of the disapproval by Overlandlords
(or  either  of  them),  this  Sublease  shall be deemed to be null and void and
without force or effect,  and  Sublandlord  and Subtenant  shall have no further
obligations or liabilities to the other with respect to this Sublease.

     10.3 Except as otherwise  specifically  provided  herein,  wherever in this
Sublease  Subtenant  is required to obtain  Sublandlord's  consent or  approval,
Subtenant  understands  that  Sublandlord  may be required  to first  obtain the
consent or approval of


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Overlandlord and/or Oversublandlord. If Overlandlord and/or Oversublandlord
should refuse such consent or approval, Sublandlord shall be released of any
obligation to grant its consent or approval, whether or not such refusal, in
Subtenant's opinion, is arbitrary or unreasonable.

     11. DEFAULT.

     11.1  Subtenant  acknowledges  that  the  services  to be  rendered  to the
Premises are not to be rendered by  Overlandlord.  Anything in this  Sublease to
the contrary notwithstanding,  if there exists a breach by Sublandlord of any of
its obligations under this Sublease and, concurrently, a corresponding breach by
Overlandlord and/or  Oversublandlord under the Overlease or Oversublease exists,
then,  and in such event,  Subtenant's  sole remedy  against  Sublandlord in the
event of any breach of  obligations  under this  Sublease  shall be the right to
pursue  a  claim   in  the  name  of   Sublandlord   against   Overlandlord   or
Oversublandlord  (as the case may be), and  Sublandlord  agrees that it will, at
Subtenant's expense, cooperate with Subtenant in the pursuit of such claim.

     11.2 Anything  contained in any provisions of this Sublease to the contrary
notwithstanding,  Subtenant agrees, with respect to the Premises, to comply with
and remedy any default claimed by Overlandlord and/or Oversublandlord and caused
by  Subtenant,  within the period  allowed to  Sublandlord  as tenant  under the
Overlease or the  Oversublease  (as the case may be) even if such time period is
shorter than the period  otherwise  allowed in the Overlease or the Oversublease
(as the case may be), due to the fact that notice of default from Sublandlord to
Subtenant is given after the  corresponding  notice of default from Overlandlord
and/or Oversublandlord. Sublandlord agrees to forward to Subtenant, upon receipt
thereof by Sublandlord, a copy of each notice of default received by Sublandlord
in its capacity as tenant under the Overlease and/or the Oversublease. Subtenant
agrees to forward to Sublandlord,  upon receipt  thereof,  copies of any notices
received  by  Subtenant   with  respect  to  the  Premises  from   Overlandlord,
Oversublandlord or from any governmental authorities.

     11.3 If and  whenever  there  shall  occur  any  event of  default  of this
Sublease,  Sublandlord  may, at Sublandlord's  option,  in addition to any other
remedy of right given under the Overlease or the  Oversublease  or by the law or
equity, do any one or more of the following:

          (a)  Terminate  this  Sublease,   in  which  event   Subtenant   shall
     immediately surrender possession of the Premise to Sublandlord;

          (b) Terminate  Subtenant's  right to possession of the Premises  under
     this Sublease without terminating the Sublease itself, by written notice to
     Subtenant,  in which event Subtenant shall immediately surrender possession
     of the Premises to Sublandlord;

          (c) Enter upon the Premises by force if necessary without being liable
     for  prosecution  or any  claim  for  damages  therefore,  and do  whatever
     Subtenant  is  obligated  to do  under  the  terms  of this  Sublease;  and
     Subtenant  agrees to  reimburse  Sublandlord  on demand  for any  direct or
     indirect  expense that  Sublandlord,  Oversublandlord  or Overlandlord  may
     incur in thus effecting


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     compliance with Subtenant's  obligations under this Sublease, and Subtenant
     further  agrees  that  Sublandlord  shall  not be  liable  for any  damages
     resulting to Subtenant from such action.

     11.4 It is hereby  expressly  stipulated by Sublandlord  and Subtenant that
any of the above listed actions, including,  without limitation,  termination of
this Sublease,  termination of Subtenant's  right to possession,  and reentry by
Sublandlord,  will not affect the  obligations  of Subtenant  for the  unexpired
Sublease Term,  including the  obligations to pay unaccrued  monthly rentals and
other  charges  provided  in this  Sublease  for the  remaining  portion  of the
Sublease Term.  Sublandlord is entitled to the same remedies as Overlandlord has
under the Overlease in addition to the above.

     12. SUBLANDLORD REPRESENTATION.

     12.1  Sublandlord  represents  (a) that it is the holder of the interest of
the Subtenant under the  Oversublease,  and (b) that the Oversublease is in full
force and effect and no default exists under the Oversublease.

     13. BROKERS.

     13.1 Each party hereto covenants, represents and warrants to the other that
it has had no dealings or communications  with any broker or agent in connection
with the  consummation  of this  Sublease  other than the brokers  identified in
Section  1.1 (v),  above,  and each  party  covenants  and  agrees to pay,  hold
harmless  and  indemnify  the other from and against  any and all cost,  expense
(including  reasonable  attorneys'  fees)  or  liability  for any  compensation,
commissions or charges claimed by any other broker or agent with respect to this
Sublease or the negotiation thereof.

     14. OPERATING EXPENSES/TAXES.

     14.1 All charges for standard  Operating  Expenses and Property  Taxes,  as
defined in the  Overlease,  incurred  during normal  business hours for the Base
Year set forth in Section 1.1 (u), above,  shall be included in the Base Monthly
Rent herein.

     14.2 Subtenant shall pay to Sublandlord  Subtenant's  Proportional Share of
increases  above the Base Year in Operating  Expenses and Property  Taxes passed
through  to  Sublandlord  pursuant  to  the  terms  of  the  Oversublease.  Upon
Sublandlord's receipt of Oversublandlord's statement setting forth the amount of
Sublandlord's share of Operating Expenses and Property Taxes,  Sublandlord shall
prepare and deliver to Subtenant a statement  setting forth the  calculation  of
Subtenant's  Proportional Share of increase above the Base Year. Subtenant shall
pay, as additional  rent, the amount set forth in said statement within ten (10)
days of Subtenant's receipt thereof.

     15 ALTERATIONS.

     15.1.  In the event  Subtenant is permitted to perform  alterations  in the
Premises  hereunder,  Subtenant  may make no  changes,  alterations,  additions,
improvements  or  decorations  in, to or about the Premises  without  submitting
detailed  plans  and   construction   schedules  to  Sublandlord  and  receiving
Sublandlord's prior written consent


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to  such  plans.  Subtenant  shall  make  no  changes,  alterations,  additions,
improvements or decorations that would result in Overlandlord or Oversublandlord
charging  Sublandlord  for  the  cost  of  same,  including  any  removal  costs
associated  therewith,  and Subtenant shall comply with all laws and regulations
relating  to such  construction,  including,  but not  limited  to,  receipt  of
certificates  of  occupancy,   permits  and  ADA  requirements,   and  shall  be
responsible  for  all  costs  associated   therewith.   Sublandlord  may  impose
reasonable  guidelines  as may be necessary to protect its  occupancy and rights
provided  in  the  Overlease  and  Oversublease,  including  placing  reasonable
restrictions  on times when  certain  types of work may be performed in order to
prevent  undue  intrusion  and  noise to  Sublandlord  or other  tenants  in the
building.

     16. SECURITY DEPOSIT.

     16.1 As security for the faithful  performance  and observance by Subtenant
of the terms, provisions,  covenants and conditions of this Sublease,  Subtenant
is simultaneously  herewith  delivering to Sublandlord a security deposit in the
amount set forth in Section 1.1 (s) (the "Security Deposit").  In the event that
Sublandlord  applies any portion of the Security Deposit in respect of a default
by Subtenant, Subtenant shall forthwith restore the amount so applied so that at
all times the amount of the Security Deposit shall be not less than the security
required to be maintained from time to time.  Sublandlord may apply the whole or
any part of the Security  Deposit to the extent  required for the payment of any
sum as to which  Subtenant is in default,  or for any sum that  Sublandlord  may
expend or may be required to expend by reason of Subtenant's default.

     16.2 In the event that Subtenant shall fully and faithfully comply with all
of the terms,  provisions,  covenants  and  conditions  of this  Sublease,  that
portion of the  Security  Deposit  not used or applied by  Sublandlord  shall be
returned to Subtenant within thirty (30) days after the Sublease Expiration Date
and  after  delivery  of  entire  possession  of the  Premises  to  Sublandlord,
Oversublandlord or Overlandlord, as the case may be.

     17. PARKING.

     17.1  Subtenant  shall be entitled to three and four tenths  (3.4)  parking
spaces  (free of charge) per one thousand  (1,000)  Rentable  Square  Footage of
Premises.

     17.2  Sublandlord  has  installed  data and phone  cabling  throughout  the
Premises.  Subtenant shall have the right,  but not the  obligation,  to use any
such wiring during the Sublease Term.

     17.3 Subtenant  shall have the right to install  reasonable  signage in and
about  the  Premises,  consistent  with  that  allowed  the  previous  Subtenant
(Myturn.com,   Inc.),   subject  to  the  reasonable  consent  of  Overlandlord,
Oversublandlord and Sublandlord, and further subject to all applicable law.

     17.4  Subject  to  the  terms  of  the  Overlease  and  the   Oversublease,
Subtenant's  authorized  employees shall have access to the Premises twenty-four
(24) hours per day, three hundred sixty-five (365) days per year.


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     18. QUIET ENJOYMENT.

     18.1. So long as the Subtenant pays all of the rent and additional rent due
under this Sublease and performs all of Subtenant's other obligations hereunder,
Subtenant  shall  peacefully  and quietly,  have,  hold and enjoy the  Premises,
subject,  however, to the terms, provisions and obligations of this Sublease and
the Overlease.

     18.2 In the event Subtenant does not completely  vacate the Premises by the
Sublease  Expiration  Date or earlier  termination of this  Sublease,  Subtenant
shall indemnify and hold harmless Sublandlord in respect of any and all holdover
charges or  penalties  imposed  under the  Overlease  or the  Oversublease  upon
Sublandlord  in  respect  of the  Premises  and in respect of any and all costs,
liabilities or expenses  (including  attorney's fees) suffered by Sublandlord in
respect of same, as and when such costs,  liabilities  or expenses are incurred.
In this regards, Subtenant shall, if requested by Sublandlord,  in Sublandlord's
sole discretion,  defend  Sublandlord  against any action or proceeding  brought
against Sublandlord that arises out of said holdover.

     19. NO WAIVER.

     19.1 The failure of  Sublandlord  to seek redress for  violation  of, or to
insist  upon the  strict  performance  of, any  covenant  or  condition  of this
Sublease or of any of the Rules and Regulations  set forth or hereafter  adopted
by  Sublandlord,  shall not prevent a subsequent act that would have  originally
constituted  a  violation  from  having all the force and effect of an  original
violation.  The receipt by  Sublandlord  of rent with knowledge of the breach of
any covenant of this Sublease shall not be deemed a waiver of such breach and no
provision of this  Sublease  shall be deemed to have been waived by  Sublandlord
unless such waiver be in writing, signed by Sublandlord. No payment by Subtenant
or receipt by  Sublandlord  of a lesser  amount  than the  monthly  rent  herein
stipulated  shall  be  deemed  to be  other  than  on  account  of the  earliest
stipulated Base Rent, additional rent or other charge, nor shall any endorsement
or statement on any check or any letter accompanying any check or payment accept
such check or payment without  prejudice to  Sublandlord's  right to recover the
balance of such Base Rent,  additional rent or other charge, or pursue any other
remedy  in this  Sublease  provided.  No act or  thing  done by  Sublandlord  or
Sublandlord's  agents  during  the  term  hereby  demised  shall  be  deemed  an
acceptance  of a surrender of the demised  premises,  and no agreement to accept
such  surrender  shall be valid  unless in writing,  signed by  Sublandlord.  No
employee of  Sublandlord or  Sublandlord's  agent shall have any power to accept
the keys of the demised  premises prior to the termination of the Sublease,  and
the  delivery  of keys to any such  agent or  employee  shall not  operate  as a
termination of the Sublease or a surrender of the demised premises.

     20. NOTICES.

     20.1 Any notice,  demand or  communication  which,  under the terms of this
Sublease or under any statue or  municipal  regulation,  must or may be given or
made by the parties  hereto shall be in writing and given or made by mailing the
same by registered or certified mail, return receipt  requested,  to the address
and person designated in Sections 1.1(a) and (c), herein.


                                 Page 10 of 12
<PAGE>

     Either party,  however,  may  designate  such new or other address to which
such  notices,  demands or  communications  thereafter  shall be given,  made or
mailed by notice  (given in the  manner  prescribed  herein).  Any such  notice,
demand or communication  shall be deemed given or served, as the case may be, on
the date of the posting  thereof.  In the event  Subtenant's  address is not set
forth  above,  notice to  Subtenant  shall be deemed  sufficient  if sent to the
Premises.

     21. MISCELLANEOUS.

     21.1 Where  applicable,  Subtenant  shall be responsible for all additional
costs  incurred  as a result of this  Sublease,  including,  but not limited to,
security cards, keys and parking cards.

     21.2 This Sublease may not be changed  orally,  but only by an agreement in
writing  signed by the party  against whom  enforcement  of any waiver,  change,
modification or discharge is sought.

     21.3 This Sublease shall not be binding upon  Sublandlord  unless and until
it is signed by Sublandlord and delivered to Subtenant.  This Section 21.3 shall
be not deemed to modify the provisions of Section 10, hereof.

     21.4 This Sublease  constitutes the entire  agreement  between the parties,
and all representations and understandings have been merged herein.

     21.5 This Sublease shall inure to the benefit of all of the parties hereto,
their successors and (subject to the provisions hereof) their assigns.




                    (The signature page follows this page.)










                                 Page 11 of 12
<PAGE>

IN WITNESS  WHERE OF, the parties have hereunto set their hands and seals on the
day and year first above written.


                                         EI VIEWSTAR, INC., Subtenant


                                         By:  /s/ John D. Woolf
                                              -----------------
                                              John D. Woolf, C.F.O.



                                         EISTREAM, INC., Guarantor


                                         By:  /s/ John D. Woolf
                                              -----------------
                                              John D. Woolf, C.F.O.



                                         TCSI CORPORATION, Sublandlord


                                         By:  /s/ Kenneth Elmer, C.F.O.
                                              -------------------------
                                              Kenneth Elmer, C.F.O.


                                 Page 12 of 12