Document:

March 13,  2001

Douglas Haffer
President and CEO
World Wide Wireless Communications, Inc.
520 Third Street, Suite 101
Oakland, CA  94607

Dear Mr. Haffer:

         The purpose of this letter is to outline the basic terms and conditions
of our proposed engagement. It is based upon our current knowledge about the
Company and the markets for your securities. The specifics of our engagement
will depend on the satisfactory results of our due diligence investigation
(including reviews of legal and accounting issues, the Company's business
prospects and a review of the Company's business plan and accompanying financial
projections.) Accordingly, we shall, at the request of the Company, provide the
services including but not limited to:

|X|      Assist in creating market awareness of your company and its stock and
         the organization and sponsorship of investor presentations. This will
         include the preparation of a corporate profile.
|X|      Provide on-going capital markets advice, including the receptiveness to
         any offering of securities by the Company.
|X|      Provide on-going advice to the Company as to stock buyback plans, stock
         splits or dividends, and other related plans as to your stock price and
         liquidity.
|X|      Attend shareholder or Board meetings as you request and make
         presentations on management's behalf.
|X|      Advise you on mergers and acquisitions of related businesses,
         particularly as it pertains to the capital markets and the market for
         the shares of the Company.  Further, as requested by the Company, we
         shall assist in due diligence and in negotiations.
|X|      Make available all corporate service group functionalities including
         but not limited to key man and D & O policies, corporate and individual
         retirement planning advice, commission free trading of company stock
         for all employees, rule 144 assistance, advice on selection of counsel,
         auditors and Board members and access to our private client group
         professionals.

         The Financial Advisor shall exercise all reasonable skill and care in
the performance of services hereunder and shall make available reasonable
amounts of time, and on reasonable notice, officers and employees of Andrew
Reckles to perform such services.

1.       Fees and Expenses

         A.       Advisory Fee. The Company will pay us a financial advisory fee
                  of 850,000 registered shares of your common stock. These
                  shares must be registered under S-8 registration within 5
                  business days of execution of this agreement.

<PAGE>

         B.       My Fee. For advising you on a successfully closed merger,
                  acquisition or divesture shall be 5% of the value of the
                  target company (or in the case of a divestiture, the value of
                  your company or division).

         C.       Expense Allowance. The Company shall pay Andrew Reckles its
                  expenses including counsel, if applicable, as they are
                  incurred in performing the services in this contract. Any and
                  all travel expenses for Board Meetings and Corporate Business
                  will be paid within 48 hours of the expense. Any expenses in
                  excess of $500.00 must have prior consent by the company.

         D.       Fees for Private Placement or Public Offering Monies Raised.
                  Shall be determined at such time.

2.       Indemnity. The Company, intending to be legally bound, hereby agrees to
         indemnify Andrew Reckles from and against any and all losses, claims
         damages and liabilities, joint or several, to which such Indemnified
         Party may become subject under any applicable federal or state law, or
         otherwise to the extent based upon claims for damages arising out of
         any transactions contemplated by, this agreement, and will reimburse
         any Indemnified Party for all reasonable expenses (including reasonable
         legal fees and expenses), as they are incurred in connection with the
         investigation or preparation for or defense of any pending threatened
         claim or any action or proceeding arising there from, whether or not
         such Indemnified Party is a party (so long as such Indemnified Party is
         involved in any such claim action or proceeding) and whether or not
         such claim, action or proceeding is initiated or brought by on behalf
         of the Company. The Company will not be liable under the foregoing
         indemnification provision to the extent that any loss, claim, damage,
         liability or expense if found, in a final judgment by a court to have
         resulted from an Indemnified party's willful misconduct or gross
         negligence.

                  If the indemnification provided for in this agreement is for
         any reason held unenforceable by an Indemnified Party, although
         otherwise applicable in accordance with its terms, the Company agrees
         to contribute to the losses, claims, damages and liabilities for which
         such indemnification is held unenforceable (I) in such proportion as is
         appropriate to reflect the relative benefits of a transaction to the
         Company and its stockholders, on the one hand, and Andrew Reckles on
         the other hand, or (ii) if (but only if) the allocation provided for in
         clause (ii) is for any reason held unenforceable, in such proportion as
         is appropriate to reflect on only the relative benefits of transaction
         referred to in clause (I) but also the relative fault of the Company,
         on the one hand, and Andrew Reckles on the other hand, as well as any
         other relevant equitable considerations: provided, however, to the
         extent permitted by applicable law in no event will the Indemnified
         Parties, in the aggregate, be required to contribute an amount in
         excess of the fees actually paid to Andrew Reckles pursuant to this
         agreement.

                  Each Indemnified Party shall notify the Company promptly of
         any claim with respect to which indemnification may be sought
         hereunder, and the Company shall have the right to assume and control
         the defense of any such claim.

<PAGE>

                  The Company agrees that, without Andrew Reckles's prior
         written consent (which will not be unreasonably withheld), it will not,
         as to Andrew Reckles or any other Indemnified Party, settle, compromise
         or consent to the entry of any judgment in any pending or threatened
         claim, action or proceeding in respect of which indemnification could
         reasonably be expected to be sought under the indemnification provision
         of this agreement, unless such settlement, compromise or consent
         includes an unconditional release of such Indemnified Party from all
         liability arising out of such claim, action or proceeding.

                  Irrespective of the number of Indemnified Parties, the Company
         shall not be liable for fees and expenses of more than once counsel for
         the Indemnified Parties (which counsel shall be satisfactory to the
         Indemnified Parties) pursuant to this letter in connection with any
         proceeding or related proceedings in the same jurisdiction or
         geographic location; provided, however, that in the reasonable opinion
         of counsel to the Indemnified Parties shall have the right to separate
         counsel, the fees and expenses of which shall be the obligation of the
         Company. The Company shall not be liable for any settlement of any
         claim without its consent, which consent shall not be unreasonably
         withheld. If the Company, or any affiliate of the Company, or any of
         their respective directors, officers, employees, agents and controlling
         persons is the principal defendant in any such action or proceeding,
         counsel selected by the Indemnified Parties shall cooperate with
         counsel for the principal defendant in the defense of such action or
         proceeding to the extent that such cooperation shall not be prejudicial
         to its clients or otherwise improper.

                  In the event that an Indemnified Party is requested or
         required to appear as a witness in any action brought by or on behalf
         of or against the Company in which such Indemnified Party is not named
         as a defendant, the Company agrees to reimburse Andrew Reckles for all
         reasonable expenses incurred by it in connection with such Indemnified
         Party's appearing and preparing to appear as such witness including
         without limitation, the reasonable fees and disbursements of its legal
         counsel.

                  Andrew Reckles shall not, and shall not cause its officers,
         agents and employees to not, make any statement of representation about
         the Company unless it is recorded in written documents supplied to
         Andrew Reckles by the Company and not inconsistent with the documents
         filed by the Company with the Securities and Exchange Commission.
         Andrew Reckles shall keep such information strictly confidential,
         except to the extent such information as or becomes public through no
         action directly of Andrew Reckles or such disclosure is required by
         law.

                  The Financial Advisor agrees to indemnify and hold harmless
         the Company, its wholly owned subsidiary, and all respective directors
         and officers who control the Company and or the subsidiary, as the case
         may be to the same extent as the foregoing indemnity from the Company
         to each indemnified party, but only with reference to written
         information relating to the Financial Advisor and to any and all
         losses, claims, damages or liabilities arising out of the failure to
         qualify any security for sale in a jurisdiction where such
         qualification for sale is necessary. In such case, the Company

                                       9
<PAGE>

         shall be the indemnified party and the Financial Advisor shall assume
         the role of defense required by the Company above.

         Any controversy or claim arising out of or relating to this agreement
or the breach of the agreement will be settled by arbitration in accordance with
the rules of the American Arbitration Association. Judgment on the award
rendered by the arbitrators may be entered in any court having jurisdiction over
the award.

         If any legal action, including an action for declaratory relief, is
brought to enforce or interpret the provisions of this agreement, the prevailing
party will be entitled to reasonable attorney's fees, which may be set by the
court in the same action or in a separate action brought for that purpose, in
addition to any other relief to which that party may be entitled.

         If the foregoing correctly sets forth your understanding, please so
indicate by signing and returning to us the enclosed copy of this, whereby this
letter shall constitute a binding agreement between us. This agreement will be
governed by and construed in accordance with the laws of the State of Georgia.
We look forward to working with you toward a successful long-term relationship.

Sincerely,

Andrew Reckles

By: ________________________________
         Andrew Reckles

World Wide Wireless Communications, Inc.

By: ________________________________
     Douglas P. Haffer<PAGE>

                                                                    EXHIBIT 10.4

                    SECOND AMENDMENT TO EMPLOYMENT AGREEMENT
                    ----------------------------------------

     This document is to amend the Employment Agreement (the "Agreement"),
entered into as of October 18, 1999, by and between Total Renal Care Holdings,
Inc. (now known as DaVita Inc.) (the "Company") and Kent J. Thiry ("Executive").
Specifically, the parties agree to amend the Agreement as follows:

     1.  Section 2.3(b) is deleted and replaced with the following:

     "The Bonus for each year shall be paid within 75 days after the last day of
such year.  Executive must be employed by the Company (or an affiliate) on the
date any Bonus is paid to be eligible to receive such Bonus and, if Executive is
not employed by the Company (or an affiliate) on the date any Bonus is paid for
any reason whatsoever, Executive shall not be entitled to receive such Bonus,
provided, however, that in the event Executive dies or is terminated by the
--------  -------
Company by reason of Disability (as defined below), Executive (or his estate)
shall be entitled to receive, at such time as bonuses for such year are
otherwise paid, a pro rated Bonus for that portion of any year prior to such
termination (or for the whole year and a portion of a year if such termination
occurs after December 31 of any year and prior to the date on which the Bonus
for such year is paid) regardless of whether Executive is employed on the date
such Bonus is paid; and provided further, that, in the event Executive is
                        -------- -------
terminated without Material Cause as defined below) or resigns following
Constructive Discharge (as defined below) at any time, Executive shall be
entitled to receive a Bonus for the year in which such termination occurs equal
to the average Bonus (excluding any extraordinary or special bonuses paid in
addition to the annual performance Bonus) that he received for the two
immediately preceding calendar years multiplied by 2.99 (if such termination
occurs prior to December 31, 2000, Executive shall receive a Bonus equal to the
guaranteed calendar year 2000 bonus ($500,000) multiplied by 2.99; if such
termination occurs prior to December 31, 2001, Executive shall receive a Bonus
equal to the Bonus received for the calendar year 2000 multiplied by 2.99),
which Bonus shall be payable within five (5) business days after the effective
date of such termination."

     2.  Section 3.3 is deleted and replaced with the following:

     "Other Termination.  The Company may terminate the employment of Executive
      -----------------
prior to the expiration of the Term for any reason or for no reason at any time
upon at least thirty (30) days' advance written notice.  If the Company
terminates the employment of Executive prior to the expiration of the Term other
than for Material Cause or Disability, or if Executive resigns within sixty (60)
days following Constructive Discharge (as defined below), Executive shall (i) be
entitled to receive the Base Salary and benefits as set forth in Section 2.1 and
                                                                 -----------
Section 2.2, respectively, through the effective date of such termination, (ii)
-----------
be entitled to receive the Bonus provided for in Section 2.3(b), (iii) be
                                                 --------------
entitled to receive a lump-sum payment equal to the Base Salary in effect as of
the date of such termination multiplied by 2.99, (iv) be entitled to continue to
<PAGE>

receive for the two-year period following the effective date of such termination
(the "Severance Period") the health insurance benefits set forth in Section 2.2
                                                                    -----------
to the extent such benefits can be provided under the Company's health insurance
policies and programs in effect at the effective time of such termination and,
to the extent such benefits cannot be provided under such policies and programs,
the Company shall purchase for Executive reasonably equivalent health insurance
benefits during the Severance Period, subject to the limitation set forth below,
and (v) not be entitled to receive any other compensation, benefits, or payments
of any kind, except as otherwise required by law or by the terms of any benefit
or retirement plan or other arrangement that would, by its terms, apply.  The
foregoing notwithstanding, in the event Executive accepts employment with
another employer during the Severance Period, (x) Executive shall immediately
notify the Company of such employment, and (y) the Company's obligation to
continue to provide certain health insurance benefits pursuant to clause (iv) of
the immediately preceding sentence shall cease."

     In all other respects, and with the exception of the previous amendment,
the Agreement remains unchanged and in full force and effect.

     DAVITA INC.

     By  /s/ Richard B. Fontaine                 11/28/00
         -----------------------------        -------------
         Richard B. Fontaine, Director             Date

     EXECUTIVE

     By  /s/ Kent J. Thiry                       11/20/00
         -----------------------------        -------------
         Kent J. Thiry                             Date

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