Document:

<PAGE>   1
CONFIDENTIAL TREATMENT HAS BEEN REQUESTED WITH RESPECT TO CERTAIN INFORMATION
CONTAINED IN THIS EXHIBIT. CONFIDENTIAL PORTIONS HAVE BEEN FILED SEPARATELY WITH
THE SECURITIES AND EXCHANGE COMMISSION.

                                                                   EXHIBIT 10.19

                                    AGREEMENT

        This Agreement is entered into as of February 3, 2000 by and between
Talarian Corporation, a California corporation ("Talarian") and Nortel Networks
Inc., a Delaware corporation ("Nortel Networks").

        A. As of the date hereof, Nortel Networks is purchasing shares of
Talarian Series D Preferred Stock pursuant to a Series D Preferred Stock
Purchase Agreement dated of even date herewith and related agreements.

        B. Nortel Networks and Talarian desire to enter into this agreement
relating to various aspects of their future relationship.

        NOW, THEREFORE, the parties hereto hereby agree as follows:

        1. Joint Development Agreement. Nortel Networks and Talarian will
negotiate in good faith to enter into a Joint Development Agreement for Talarian
products within 120 days from the date hereof. The parties acknowledge that
there are many issues involved in such an agreement that they have not yet
considered or discussed.

It is expected that the Joint Development Agreement will address the following
development efforts:

               [ **                                          ]

No agreement pertaining to the matters set forth in this Section 1 shall be
binding until (and unless ) the parties enter into a definitive Joint
Development Agreement.

        2.     [ **                                          ]

        3. Creation of Talarian Technical Advisory Board. Talarian will create a
Technical Advisory Board ("TAB") with appropriate individuals designated by
Talarian's Board of Directors. The members of the TAB will be compensated for
their participation in the TAB with equity of Talarian.

        4. Creation of Test Lab. Talarian agrees that it will establish and
staff a test lab on its site for the purpose of [ ** ]

        5.     [ **                                          ]

**Confidential treatment has been requested with respect to certain
information contained in this document. Confidential portions have been
omitted from the public filing and have been filed separately with the
Securities and Exchange Commission.

                                       1
<PAGE>   2

        6. License to Nortel in Event of Sale of Talarian. In the event Talarian
is acquired by a third party (other than Nortel Networks) at any time (a "Change
of Control"), Talarian agrees that it will provide Nortel Networks with a
non-exclusive, perpetual, worldwide license to use (but not to resell or
distribute (other than in object code as embedded in Nortel Networks products)),
for a period of two years after the Change of Control, the Talarian source code
for (i) any software being licensed to Nortel Networks by Talarian at the time
of the Change of Control, and (ii) any Talarian software rightfully in Nortel's
possession at the time of the Change of Control that Nortel agrees to license on
reasonable terms, all as such exists on such date, together with any subsequent
updates or "bug fixes" made to such software during such two year period. The
source code may only be used for the purpose of, and only to the extent needed
to, run, support and otherwise continue to maintain, any Nortel Networks
products that incorporate or rely on any Talarian software. This provision will
only apply to the first Change of Control of Talarian after the date hereof, but
any second or additional Change of Control shall not limit Talarian's
obligations arising from the first Change of Control. Nortel Networks will pay
Talarian reasonable royalties for this license, to be negotiated by the parties
in good faith.

        7. Marketing Exclusivity. For 12 months after the date hereof Nortel and
Talarian will be marketing partners and during such period (i) Nortel will not
become a marketing partner for any type of publish/subscribe and multicast
middleware other than with Talarian and (ii) Talarian will not become a
marketing partner with any of the entities set forth on Exhibit A; provided,
however, that Talarian will not be prohibited from soliciting support from any
third party in the pursuit of IETF standards or similar standards efforts for
multicast protocols. In furtherance of this marketing relationship between
Talarian and Nortel Networks, Talarian agrees that it will, to the extent
reasonable, (i) recommend Nortel Networks equipment to its customers as the
preferred networking solution, (ii) give its customers that are [ ** ]
information about Nortel Networks equipment, (iii) provide Nortel Networks with
advance notice of its scheduled sales calls and allow Nortel Networks to do
joint sales calls with Talarian, including sales calls into [ ** ] accounts, and
(iv) give Nortel Networks access to its customers within Talarian's reasonable
discretion; and Nortel Networks agrees that it will, to the extent reasonable,
(i) recommend Talarian products to its customers as the preferred financial
middleware solution, (ii) give its customers that are [ ** ] information about
Talarian products, (iii) provide Talarian with advance notice of its scheduled
sales calls and allow Talarian to do joint sales calls with Nortel Networks,
including sales calls into [ ** ] accounts, and (iv) give Talarian access to its
customers within Nortel Networks' reasonable discretion.

        8. Research and Development Exclusivity. For 12 months after the date
hereof, Talarian will not enter into any agreement pursuant to which Talarian
receives consideration for research and development from any of the parties
listed on Exhibit B hereto, provided however, that Talarian will not be
prohibited from entering into an OEM, ISV, reseller agreement or similar
agreement with any third party for the sale of Talarian software products or
services consistent with the ordinary course of its business.

        9.     [ **                                ]

**Confidential treatment has been requested with respect to certain
information contained in this document. Confidential portions have been
omitted from the public filing and have been filed separately with the
Securities and Exchange Commission.

                                       2
<PAGE>   3

        10.    Miscellaneous.

               a. Entire Agreement. This Agreement constitutes the entire
agreement between the parties with respect to the subject matter hereof and
supersedes any prior agreement or understanding between the parties with respect
thereto.

               b. Amendment Waiver. Any term of this Agreement may be amended
only by a writing signed by Talarian and Nortel Networks. The observance of any
term or provision of this Agreement may be waived only by a writing signed by
the party to be bound by such waiver.

               c. Assignment. This Agreement may not be assigned by either party
hereto without the written consent of the other party, except that any party may
assign this Agreement in connection with any merger, consolidation or similar
transaction.

               d. Governing Law. This Agreement will be governed by and
construed in accordance with the internal laws of the State of California,
excluding application of any conflict of law doctrines that would make
applicable the law of any other state or jurisdiction, and where appropriate
federal law. The parties hereto submit to the exclusive jurisdiction and venue
of any state or federal court located in Santa Clara County, California for
purposes of any action arising of or related to this Agreement.

               e. Notices. Any notice required or permitted to be given
hereunder shall be in writing and shall be effective and deemed given under this
Agreement on the earliest of (i) the date of personal delivery, (ii) the date of
sending by facsimile, (iii) the business day after deposit with a nationally
recognized courier or overnight service or (iv) three business days after
deposit in the United States mail by registered or certified mail, return
receipt requested. All notices not delivered personally or by facsimile will be
sent with postage and other charges prepaid and properly addressed to the party
to be notified at the address set forth below, or at such other address as the
party may designate by ten (10) days advance written notice to the other party
hereto.

               Notices to Talarian: Talarian Corporation
                                    333 Distel Circle
                                    Los Altos, CA  94022
                                    Attn:  President

               Notices to Nortel:   Nortel Networks Inc.
                                    600 Technology Park
                                    Massachusetts, MA 01821
                                    Attn: VP, Strategy & Technology Investments

                                    with a copy to:
                                    Nortel Networks Inc.
                                    4401 Great America Parkway
                                    Santa Clara, CA 95052
                                    Attn: Law Department

                                       3
<PAGE>   4

        IN WITNESS WHEREOF, the parties hereto have entered into this Agreement
as of the date first written above.

NORTEL NETWORKS INC.                         TALARIAN CORPORATION

By: /s/ Paul D. Callahan                     By: /s/ Paul Larson
   --------------------------------             --------------------------------
                                                   Paul Larson, President & CEO

Its: V.P., Strategy and Technology
    -------------------------------

                                       4
<PAGE>   5

                                    EXHIBIT A

[ **                               ]

**Confidential treatment has been requested with respect to certain
information contained in this document. Confidential portions have been
omitted from the public filing and have been filed separately with the
Securities and Exchange Commission.

                                       5
<PAGE>   6

                                    EXHIBIT B

[ **                               ]

**Confidential treatment has been requested with respect to certain
information contained in this document. Confidential portions have been
omitted from the public filing and have been filed separately with the
Securities and Exchange Commission.

                                       6
<PAGE>   7

                                  AMENDMENT TO

                                 SIDE AGREEMENT

                                 BY AND BETWEEN

                              TALARIAN CORPORATION
                                       AND
                              NORTEL NETWORKS, INC.

        This Amendment ("Amendment") to the Side Agreement dated February 3,
2000 of the Series D Preferred Stock Purchase Agreement dated February 3, 2000
by and between Talarian Corporation and Nortel Networks Inc. (the "Agreement")
is dated May 31, 2000. Capitalized terms used but not defined herein shall have
the meanings assigned to such terms in the Agreement.

1.      Amendment:

The parties agree to amend Section 1 "Joint Development Agreement" of the
Agreement, by extending the negotiation period within which they are to
negotiate in good faith to enter into a Joint Development Agreement by an
additional 120 days from the date the period expires in the Agreement.

        EXCEPT AS SET FORTH HEREIN, this Amendment shall not, by implication or
otherwise, limit, impair, constitute a waiver of, or otherwise affect the rights
and remedies of any of the terms, conditions, obligations, covenants or
agreements contained in the Agreement, all of which are ratified and affirmed in
all respects. This Amendment may be executed in two or more counterparts, each
of which shall constitute an original but all of which taken together shall
constitute but one contract. Delivery of an executed counterpart of a signature
page of this Amendment by facsimile transmission shall be as effective as
delivery of a manually executed counterpart of this Amendment.

        The terms and conditions of the Agreement, unless as explicitly stated
and amended in this Amendment, shall remain in full force and effect.

        IN WITNESS WHEREOF, the parties have caused this Amendment to be
executed by its authorized representatives.

NORTEL NETWORKS, INC.                        TALARIAN CORPORATION

By:  /s/ PAUL D. CALLAHAN                    By:  /s/ MICHAEL A. MORGAN
     --------------------------------             ---------------------------

Name:  Paul D. Callahan                      Name:  Michael A. Morgan
Title:  V.P., Strategy and Technology        Title:  Chief Financial Officer
        Investments<PAGE>   1

                                                                   EXHIBIT 10.25

                        WARRENVILLE WOODS OFFICE COMPLEX

                                      LEASE

1.  DATE OF LEASE     April 15, 2000

2.  TERM              April 1, 2000 (or tenth business day after Lessee's date
                      of acceptance of premises) through December 31, 2005

3.  LESSOR            TJR Management
                      P.O. Box 628
                      Warrenville, IL  60555

4.  LESSEE            Talarian
                      333 Distel Circle
                      Los Altos, CA  94022-1404

5.  PROPERTY          Suites #205, 206, 207, 208, 209, 301, 302, 303, 304, 305,
                      306, 307, 308, 309
                      29W110 Butterfield Road
                      Warrenville, IL  60555

6.  PREMISES          Square Footage:       5,350 Second Floor
                      Square Footage:       8,000 Third Floor

7.  BUSINESS

8.  DEPOSIT           $6,945.00 Upon acceptance, as security deposit
                                                                 PAID 12/15/1999
                      $10,000.00 Upon acceptance, as security deposit for third
                      floor due by May 15, 2000
                      $6,945.00 First months rent                PAID 12/15/1999
                      $175.00 For (2) signs outside              PAID 12/15/1999
                      $175.00 For (2) more signs due by May 15, 2000

9.  RENT SCHEDULE

<TABLE>
<CAPTION>
                                                                     MGT. & MAINT.
                        BASE RENT         TAXES           INSURANCE       FEES          TOTAL
<S>                     <C>           <C>                 <C>       <C>               <C>
Months 1 through 9       5,307.33               676.38      106.10    156.04/695.50    6,941.35
Months 10 through 22    13,307.33             1,687.78      264.75  389.38/1,735.50   17,384.74
Months 23 through 35    13,973.29     TO BE DETERMINED
Months 36 through 48    14,671.95     TO BE DETERMINED
Months 49 through 60    15,405.54     TO BE DETERMINED
April 2000, May 2000, June 2000 - $3,333.33 each month to hold the third floor
</TABLE>

Due the 1st of every month: Base rent and all pro-rated taxes, insurance and
maintenance & management fees.

Lease is calculated at $12.00 per square foot from month 1 through 12 at a 5%
per one year base rent.

                                      -1-
<PAGE>   2

Maintenance fees based on $1.56 per square foot and will be re-calculated
annually, in December, along with real estate taxes and insurance. Management
fees based on a $.35 per square foot.

In consideration for rental of the 3rd floor at no charge from July 1, 2000
through Dec. 31, 2000, Talarian will grant Tim Raymond an option to purchase
6,000 shares of Talarian stock at a price of $3.18 per share. And will send out
the stock agreement to Tim Raymond within 2 weeks of signing the lease. This
shall be a fully vested standard stock agreement on the day Talarian stock goes
public, which will be a ten year option to purchase the stock. Also, I would
like the option of purchasing additional shares of stock at the IPO offering.

10. UTILITY & MAINTENANCE CHARGES. During the period in which Lessee occupies
the Premises, Lessee shall pay or reimburse Lessor for all utility charges and
maintenance charges applicable to the Premises, including and limited to
electricity, gas, water, sewer, garbage, lawn and shrubbery maintenance,
cleaning or driveway maintenance or sign for each owner, snow removal, outside
canopy maintenance charges, cleaning and maintenance (including common areas).
Private contractor charges to be usual and customary for similar service and for
the local area. Said charges shall be paid by Lessee in full service and for the
local area. Said charges shall be paid by Lessee in full if metered to the
Premises or directly charges applicable to the Premises. In the case of shared
expenses, Lessee shall pay its prorated share of said expenses, providing that
Lessor submits detailed basis of computation and photocopies of paid receipts
and invoices in a timely manner but no less than annually. Snow removal and any
other pertinent charges to be specifically allocated.

11. TAXES. Lessee shall pay its prorated share of the real estate taxes, special
assessments, and other governmental charges which become payable during the
period of time for which such taxes or charges are levied; provided, however,
that the payments required of Lessee hereunder shall be prorated in the event
that Lessee has not occupied the Premises for the full twelve month period
immediately preceding the required payment date. If an adjustment is needed at
the end of the year, Lessee shall pay to Lessor any amount owed within thirty
days of billed date. Lessor shall credit Lessee any amount owed within thirty
days of billed date. Payment may be made on a monthly basis as agreed by both
parties.

12. INSURANCE. Lessee shall pay its prorated share of the insurance premiums
paid by Lessor for fire and casualty insurance during the period in which Lessee
occupies the Premises provide coverage is limited to levels acceptable to
Lessee. Lessee indemnifies and holds Lessor harmless from any claim against or
cost incurred by Lessor resulting directly or indirectly from Lessee's negligent
acts or omissions; provided, however, that this indemnity shall not apply to any
such claims directly resulting from the negligence of Lessor or its agents.

13. ASSIGNMENT AND SUBLETTING. Lessee shall not assign its interest in this
Lease or sublet the Premises without the prior written consent of Lessor, which
consent shall not be unreasonably withheld.

14. CONDITIONS OF POSSESSION AND TERMINATION. Lessee will examine the Premises
and will accept the same in the condition in which they appear as of the date of
Lessee's occupancy, and Lessee acknowledges that no representations have been
made by Lessor relating to the condition

                                      -2-
<PAGE>   3

of the Premises, other than by separate written agreement. Upon the expiration
of this Lease, Lessee shall deliver up possession of the Premises to the Lessor
in the same condition, ordinary wear and tear excepted.

15. ACCESS OF LESSOR. Lessor shall have access to the Premises during reasonable
hours if necessary, provided that Lessor provides to Lessee reasonable notice of
said access.

16. REPAIR & DAMAGE. Lessee, at Lessee's expense, shall keep the premises in a
good state of repair, which shall include the necessary replacement of any plate
glass, windows, storms, and screen windows, fixtures, or equipment on the
premises, and Lessee shall repair promptly, at Lessee's expense any damage to
the interior of Premises or the property of which the Premises are a part (roof,
exterior walls included), which damage results from Lessee's negligent use or
occupancy of the Premises. All damage due to ground settlement or construction
defects will be repaired at Lessor's expense.

      HVAC equipment replacement to be at expense of Lessor. Lessee is to
maintain HVAC, but commencing in the third lease year this liability will be
subject to a limit of one repair service call per month for not more than two
successive months before Lessor assumes liability. If the Premises are rendered
substantially untenantable (i.e., more than twenty percent of usable square
footage) by fire, construction faults or other casualty, not caused by Lessee,
upon written notice to the other during said thirty-day period of
untenantability, rent shall abate, as of the date if such casualty and utility
such time as repairs are made by Lessor to the satisfaction of Lessee. Lessor
agrees to make any necessary repairs to the exterior and structural portions of
the improvements including but not limited to roofs, walls, canopies, office
front, exterior doors, driveways, parking and service facilities and to repaint
all exterior painted portions of said improvements when necessary, but in no
event less than once every five (5) years; provide and maintain adequate
connections with the local water supply, sewerage system, gas, electrical, and
alterations, repairs and replacements, interior and exterior, when necessary as
a result of faulty construction of Lessor's failure to promptly discharge its
obligations itemized herein, pay all permit and inspection fees (including
without limitation driveway fees) imposed by governmental authorities, except
fees relating to Lessee's business and signs.

17. SUBORDINATION. Lessee agrees to subordinate this Lease to any mortgage or
trust deed which hereafter may be placed on the property of which the Premises
are a part, provided that said mortgagee or trustee agrees to recognize Lessee's
rights under this Lease.

18. LESSOR AND LESSEE REMEDIES. In the event either party is in default under
one or more of the provisions of this Lease, the other party shall have all of
the rights and remedies afforded to it by law.

19. PAYMENTS. All payments of rent shall be due on the first of each month and
deemed late after the fifth of each month, and all other payments and
reimbursements required by this Lease shall be payable within ten (10) days
after receipt of notice thereof. If rent or other payments are not received when
due as provided herein, a five percent (5%) penalty will result. Lessee also
agrees not to prepay rent more than one month at the time.

                                      -3-
<PAGE>   4

20. NOTICES. Required notices shall be sent to such addresses as the parties may
from time to time in writing direct, and failing such directions, notices, shall
be sent to the Lessee at the Premises and to the Lessor at: P.O. Box 628,
Warrenville, Illinois 60555.

21. MISCELLANEOUS. This Lease shall be binding upon the parties' agent,
successors and assigns. All remedies provided for herein shall be non-exclusive.
All clauses and paragraphs herein contained shall be severable from all others.
All genders and singulars shall include all other genders and plurals. Lessor
may at any time and from time to time promulgate customary and reasonable
"rules" for the care and occupancy of the Premises, provided such "rules" are
universally applied to all tenants of the center.

22. OPTION TO EXTEND TERM. Lessee shall have the options to three (3) successive
extensions of the term of this Lease for (5) full lease years with respect to
each such option, subject to the terms, covenants and provisions of this Lease
except as hereafter provided. Lessee may exercise each said option by giving
Lessor written notice, not less than four (4) months prior to the beginning of
each such period of extension. The word "term" whenever used context otherwise
requires. Lessee's base rent increase may not exceed the greater of the Consumer
Price Index's increase over the "base year" of the U.S. Government's fiscal year
ending or six percent which ever is less.

23. INTERIOR CONDITION. Lessee shall accept the space in accordance with the
attached "Tenant Specification Sheet" and plans which will be mutually agreed by
both parties hereto.

24. SIGNS: OFFICE FRONTS. Lessee shall not, without Lessor's prior written
consent (a) make any structural changes to or paint the office front; or (b)
install any exterior lighting, decorations, or paintings; or (c) erect or
install signs of any type which can be viewed from the exterior of the Demised
Premises, without the prior written consent of Lessor.

All signs, decorations and advertising media shall conform in all respects to
the sign criteria established by Lessor for the Office Complex time to time in
the exercise of its sole discretion and shall be subject to the prior written
approval of the Lessor as to construction, method of attachment, size, shape,
height, lighting, color and general appearance. All signs shall be kept in good
condition and in proper operating order at all times.

Lessor shall supply and maintain exterior signage at Lessor's discretion and at
Lessee's expense.

25. LESSEE'S IMPROVEMENTS. Subject to Lessor's prior written approval of all
plans and specifications, Lessee shall at Lessee's sole cost and expense
construct with respect to the Premises, interior partitions, interior office
front fixtures, and interior signing. Prior to making such improvements, Lessee
shall consult with Lessor's architect at Lessee's cost. All of Lessee's work
shall be done in accordance with all applicable statutes, ordinances,
regulations and codes. Lessee shall deposit with Lessor, for Lessor's
inspection, full waivers of lien for all labor, materials and supplies involved
within seven (7) days of substantial completion of said work and prior to making
any payment for any such work, provided that Lessee is in receipt of such lien
waivers from the respective laborers and materialmen. If Lessee fails to deposit
said waivers and Lessor is required to pay for any work done, then any sums so
paid by Lessor and all costs incurred in connection therewith, including
reasonable attorney's fees, shall be immediately due

                                      -4-
<PAGE>   5

Lessor. Such sums not paid by Lessee within 30 days from written demand shall
earn interest at the rate of eighteen (18) percent per annum. All of the
aforesaid leasehold improvements (except trade fixtures) shall become the
property of Lessor upon termination of this Lease.

26. USE OF PREMISES. The premises may be used only for general office practice
or for such other uses with the prior written consent of Lessor. Lessee shall
use in the transaction of business in the Premises the trade name listed here
and no other trade name without the prior written consent of Lessor. Lessee
shall not at any time leave the Premises vacant, but shall in good faith
continuously throughout the term of this Lease conduct and carry on in the
entire Premises the type of business for which the Premises are leased. Lessee
shall, except during reasonable periods of repairing, cleaning and decorating
keep the Premises open to the public for business with adequate and competent
personnel in attendance on all days and during all hours (including evenings)
established by Lessee from time to time as office hours, and during any other
day hours when the Office Complex generally is open to the public for business,
except to the extent Lessee may be prohibited from being open for business by
applicable law, ordinance, governmental regulation or general business
conditions.

Lessee shall not, without Lessor's prior written consent, keep anything within
the Premises for any purpose which increases the insurance premium cost or
invalidates any insurance policy carried on the Premises or other part of the
Office Complex. Lessee shall pay as additional rent, upon demand of Lessor, any
such increased premium cost due to Lessee's use or occupation of the Premises.

Lessee shall not conduct within the Premises any fire, auction or bankruptcy
sales or operate within the Premises a "wholesale" or "factory outlet" office, a
"cooperative" office, a "second hand" office, a "surplus" store or a store
commonly referred to as a "discount house." Lessee shall not advertise that it
sells products or services are "discount," "cut-price," or "cut-rate" prices.
Lessee shall not permit any objectionable or unpleasant odors to emanate from
the Premises, nor place or permit any radio, television, loudspeaker or
amplifier on the roof or outside the Premises or where the same can be seen or
heard from outside the building or distribute leaflets or other advertising
material in the Common Area; nor take any other action which in the exclusive
judgment of Lessor would constitute a nuisance or would disturb or endanger
other tenants of the Office Complex or unreasonably interfere with their use of
their respective premises, not do anything which would tend to injure the
reputation of the Office Complex.

Lessee shall take good care of the Premises and keep the same free from waste at
all times. Lessor shall keep the Premises and sidewalks, service-ways and area
adjacent to the Premises neat, clean and free from dirt, rubbish, insects, and
pests at all times, and shall remove all trash and garbage within the Premises.
Lessee will store all trash and garbage within the area designated by Lessor for
such trash pickup and removal and only in receptacles of the size, design and
color from time to time prescribed by Lessor. Receiving and delivery of goods
and merchandise and removal of garbage and trash shall be made only in the
manner and areas from time to time prescribed by Lessor. Lessor will designate
scavenger service company for collection of all trash and garbage. Lessee shall
not operate an incinerator or burn trash or garbage within the Office Complex.

                                      -5-
<PAGE>   6

Lessee shall maintain all windows in a neat, attractive condition.

Lessee shall procure, at its sole expense, any permits and licenses required for
the transaction of business in the Premises and otherwise comply with all
applicable laws, ordinance and governmental regulations.

27. EXCLUSIVE RIGHTS. Lessee covenants that during the term of this Lease and
any extensions or renewals thereof, the office premises nor any part thereof in
the Warrenville Woods Office Complex, other than leased premises, shall not be
used or occupied, without Lessor's written agreement, for the retail selling of
convenient food store products including deli items, fast food of any kind for
the consumption on or off the premises, the sale of cigarettes other than by
vending machine, automatic teller machine, post office substation or drop site,
lottery/lotto game ticket sales, or as a health center, pool hall, electronic
game center, fast food restaurant, snack shop, bar/tavern, or liquor store. In
the event of a breach or threatened breach of said covenant, Lessor shall be
entitled to injunctive relief and any other appropriate remedy.

28. COMPLIANCE. Lessor covenants that Lessor is and will remain in full
compliance with any and all governmental regulations regarding use and occupancy
of the Center and its site.

29. OCCUPANCY. The term of this Lease shall begin on the earlier of (i) the day
Lessee opens for business with the public in the leased premises, or (ii) the
tenth (10) business day following the acceptance by Lessee of a) the
improvements to be constructed on the leased premises or whichever is earlier.
Lessor agrees to notify Lessee ten (10) days in advance of the time when Lessee
can commence Lessee's Work. Lessee agrees to commence such work forthwith and
diligently carry it to completion. Lessee shall be allowed reasonable time for
the completion of Lessee's Work and shall not have opened its office for
business as provided herein, then Lessee's rental shall nevertheless commence on
the date on which Lessee should have opened for business in accordance with the
foregoing schedule at the rate of 1/15th of the monthly amount of Lessee minimum
Rent payment per day until Lessee shall open for business.

30. PARKING/ Lessor shall require all tenants and occupants of the Office
Complex and their employees to park their automobiles in a portion of the
parking area designated for such purpose, which area shall be located in the
part of the Office Complex least likely to be used by the customers of Lessee
and other tenants and occupants of the Office Complex. At no time may Lessee or
employees of Lessee be permitted to park a disabled vehicle, mobile home,
trailer, trailer, boat or any other recreational vehicle in the Office Complex
parking area.

31. PAY TELEPHONE. Lessee agrees that no pay telephones may be installed on
behalf of Lessee on Pylons between tenant spaces without the approval of Lessor.

32. NOTIFICATION. Lessee agrees to give written notice 30 days before any
termination or surrender of the lease prior to maturity to:

TJR Management Co., P.O. Box 628, Warrenville, ILL.  60555

Or such other addresses as Lessor may direct from time to time, in writing. If
written notification is not given 30 days before termination or surrender of the
lease, Lessee will then forfeit its Security Deposit.

                                      -6-
<PAGE>   7

33. Either party shall have 30 business days to cure any default under the terms
of this lease provided that nondefaulting party so notifies in writing the
defaulting party as to such default.

Any parties signing this agreement on behalf of any corporation acknowledge that
they have authority from their respective boards of directors to execute this
lease.

In Witness Whereof, the parties hereto have executed this Lease the date first
above written.

Lessor:                                      Lessee:

TJR Management Co.                           Talarian Corporation

/s/ TIMOTHY J. RAYMOND                       /s/ MICHAEL A. MORGAN    5/15/00
-----------------------------------          -----------------------------------
                                             Signature & Date

                                      -7-

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