Document:

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                                                                     Exhibit 4.3

                               [IXATA LETTERHEAD]

August 6, 1999

Ms. Cheryl Monblatt
406 Bay Berry Place
Encinitas, CA 92024

Dear Ms. Monblatt,

As discussed we are pleased to offer you the position of Director of Investor
Relations at IXATA.com

We are anticipating your start date as August 23, 1999, at a retainer of $5,000
per month.  Our understanding is that upon IXATA securing our next round of
major funding, your compensation would increase to $105,000 and you would assume
these duties on a full time basis.

As an incentive, we have agreed you would receive 10,000 shares as upon
commencement of your duties, which shares will vest at your first anniversary of
employment.  Additionally you can purchase up to 25,000 shares at 80% of market
price TBD at the most recent 30 day trading period prior to the date of your
intention to exercise.  During your fist 60 days of employment, we will lay out
an incentive stock option plan based on specific performance, to be mutually
agreed upon.

We are looking forward to having you on board.

Sincerely,

/s/ Fred Gluckman
------------------------
Fred Gluckman
Chairman of the Board
IXATA.com<PAGE>

                                                                     Exhibit 4.4

                               [IXATA LETTERHEAD]

September 16, 1999

Ms. Lacretia Bachhofer
2250 Regency Point
San Antonio, TX 78231

Dear Ms. Bachhofer,

Congratulations!  On the behalf of IXATA.COM and myself, I would like to inform
you that as a result of our recent discussions, we are pleased to offer you a
position as Manager, Business Development based upon the following:

SALARY: $45,000 per annum

PROBATIONARY PERIOD: 90 Days

COMMISSIONS & BONUS: No commissions are payable.  However, you will be eligible
for a bonus program that will be determined within 60 days after completion of
your probationary period.

STOCK: 5,000 shares will be vested to you upon the successful completion of one
year of service.  In the event that you fail to complete one year of service,
the total value of your shares will be reduced by the prorated value of the
difference between your employment start date and your departure date.  No
shares will be earned until you have completed your probationary period.  In
addition, you will be vested an additional 1,000 shares of stock for every year
of service that you completed up to your fifth year of employment.  Stock
offerings after your fifth year of employment will be as determined by the Board
of Directors of IXATA.COM.

STOCK OPTIONS: You will have the right to purchase up to an additional 1,000
shares of stock upon the successful completion of each year of employment up to
your fifth year of employment at 80% of the stock value on your employment
anniversary date.  This stock option is valid for only a ninety-day period of
time beginning with the anniversary date of your employment.  Stock options
after your fifth year of employment will be as determined by the Board of
Directors of IXATA.COM.

EMPLOYEE BENEFITS: You will be eligible for the same medical, dental, and 401k
plans available to all IXATA.COM employees after successful completion of your
probationary period.
<PAGE>

EDUCATIONAL BENEFITS: You will be eligible for tuition reimbursement to an
accredited university for company authorized course work with a minimum grade of
a "B."  Such benefits will become effective after completion of your
probationary period.

ASSIGNED DUTIES: Your position as Manager, Business Development will be to
accomplish assigned sales, marketing, and business development activities
consisting of, but not limited to, the following:

 .   Represent the Executive Vice President, Marketing at assigned meetings,
    demonstrations, and presentations

 .   Coordinate and generate all proposal, follow-up, and contract activities

 .   Assist in the development and continuation of strategic business
    partnerships

 .   Develop, publish, and maintain a corporate marketing plan

 .   Be responsible for the weekly generation and publication of sales activities
    reports

 .   Develop, publish, and organize a sales training program for corporate sales
    staff

 .   Coordinate all actions and activities of the corporate sales staff

 .   Assist the corporate sales staff in facilitating the support and
    administration of accounts

 .   Work with the Director, Corporate Communications, to design, develop, and
    publish sales and marketing materials, press releases and articles

 .   Represent the company at assigned association meetings and conventions

 .   Accomplish research and analysis of sales and marketing efforts

 .   Accomplish sales and marketing activities as assigned

 .   Establish and maintain a customer feedback program

 .   Organize and maintain a corporate communication medium for the transmission
    of information to sales staff

 .   Manage the central database of corporate accounts and prospects

SPECIAL CONDITIONS: Pending a decision otherwise, you will be permitted to work
from your home.  IXATA will coordinate with you to either provide you or
reimburse you for the necessary equipment and capabilities to conduct business
from your home.

                                       2
<PAGE>

OFFER ACCEPTANCE PERIOD: This offer shall remain valid and effective until
Friday, September 24, 1999.

SUPERVISOR: You will report directly to the Executive Vice President, Marketing.

START DATE: October 4, 1999 or earlier as may be mutually agreed upon by both
parties.

We look forward to your acceptance of this offer and your employment with our
company.  If you have any questions, please do not hesitate to contact the
undersigned at 800-473-6748 or via e-mail at

Please indicate your acceptance of this offer below and submit an original
signed copy to our office no later than the expiration date of this offer.

Best Regards,

/s/ Robert A. Steiner
---------------------------
Robert A. Steiner
President

RAS/mm

Accepted

/s/ Lacretia Bachhofer
----------------------              ___________________________
Signature                           Date

** Vacation and holiday benefits as discussed with Mr. Steiner; November 26th,
December 29th-January 8/th/.

                                       3<PAGE>

                                                                     Exhibit 4.5

                               [IXATA LETTERHEAD]

June 30, 1999

Ms. Maureen Dime
San Diego, California 92111

Dear Ms. Dime,

Congratulations!  As a result of your discussions with the management of
IXATA.COM, I am pleased to offer you a position as Sales Manager based upon the
following:

Salary: $50,000 per annum

PROBATIONARY PERIOD: 90 Days

STOCK: 5,000 shares will be vested to you upon the successful completion of one
year of service.  In the event that you fail to complete one year of service,
the total value of your shares will be reduced by the prorated value of the
difference between your employment time and your departure date.  No shares will
be earned until you have completed your probationary period.

COMMISSIONS & BONUS: No commissions are payable.  However, you may be eligible
for bonuses based upon your performance.  Details will be discussed during your
first 90 days.

SALES QUOTA: Will be established during your first 30 days of employment

BENEFITS: You will be eligible for the same medical, dental, and 401K plans
available to all IXATA.COM employees after successful completion of your
probationary period.

START DATE: To be mutually agreed upon but no later than July 16, 1999.

CONTINGENCIES: This offer shall remain valid and effective until Friday, July 2,
1999 and shall be contingent upon a successful reference check and validation of
your current salary

We look forward to your acceptance of this offer and your employment with our
company.  If you have any questions, please do not hesitate to contact the
undersigned at 949-632-3260 or via e-mail at rsteiner@rfpexpress.com

Please indicate your acceptance of this offer below and submit a signed copy to
our offices no later than the expiration date of this offer.
<PAGE>

Best Regards,

/s/ Robert A. Steiner
----------------------------
Robert A. Steiner
Executive Vice-President

RAS/bs

Accepted

/s/ Maureen Dime                   7-1-1999
---------------------------------------------------------------
Signature                           Date

                                       2<PAGE>

                                                                     Exhibit 4.6

                               [IXATA LETTERHEAD]

September 16, 1999

Ms. Luciana Manfredi
640 Camino Del La Reina, #1114
San Diego, CA 92108

Dear Ms. Manfredi,

Congratulations!  As a result of your discussions with the management of
IXATA.COM, I am pleased to offer you a position as Sales Manger based upon the
following:

Salary: $50,000 per annum

PROBATIONARY PERIOD: 90 Days

COMMISSIONS & BONUS: No commissions are payable.  However, you will be eligible
for bonuses based upon your performance.  Details will be discussed upon
completion of your probationary period.

STOCK: 5,000 shares will be vested to you upon the successful completion of one
year of service.  In the event that you fail to complete one year of service,
the total value of your shares will be reduced by the prorated value of the
difference between your employment start date and your departure date.  No
shares will be earned until you have completed your probationary period.

STOCK OPTIONS: You will have the right to purchase up to an additional 1,000
shares of stock upon the successful completion of each year of employment up to
your fifth year of employment  at 80% of the stock value on your employment
anniversary date.  This stock option is valid for only a ninety-day period of
time beginning with the anniversary date of your employment.  Stock options
after your fifth year of employment will be as determined by the Board of
Directors of IXATA.COM.

EMPLOYEE BENEFITS: You will be eligible for the same medical, dental, and 401k
plans available to all IXATA.COM employees after successful completion of your
probationary period.

START DATE: To be mutually agreed upon but no later than October 11, 1999.

SUPERVISOR: You will report directly to Mr. Joseph Friedmann, National Director
of Sales.

OFFER ACCEPTANCE PERIOD: This offer shall remain valid and effective until
Friday, September 24, 1999 and shall be contingent upon a successful reference
check and validation of
<PAGE>

your current salary.

We look forward to your acceptance of this offer and your employment with our
company.  If you have any questions, please do not hesitate to contact the
undersigned at 800-473-6748 or via e-mail at rsteiner@rfpexpress.com.

Please indicate your acceptance of this offer below and submit an original
signed copy to our offices no later than the expiration date of this offer.

Best Regards,

/s/ Robert A. Steiner
--------------------------
Robert A. Steiner
President

RAS/mm

Accepted

/s/ Luciana Manfred                         9/23/99
--------------------------------    ------------------------------
Signature                           Date

                                       2

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