EXHIBIT 10.18

                                 AMENDMENT FIVE
                                     TO THE
                            MANAGED NETWORK AGREEMENT
                                     BETWEEN
                       SPRINT COMMUNICATIONS COMPANY, L.P.
                                       AND
                               BRIDGE DATA COMPANY

CONFIDENTIAL MATERIALS HAVE BEEN OMITTED FROM THIS EXHIBIT PURSUANT TO A REQUEST
FOR  CONFIDENTIAL  TREATMENT AND HAVE BEEN FILED  SEPARATELY WITH THE SECURITIES
AND EXCHANGE COMMISSION. ASTERISKS DENOTE OMISSIONS.

The  Managed  Network  Agreement  ("Agreement")  between  Sprint  Communications
Company, L.P. ("Sprint") and Bridge Data Company ("Bridge"), having an effective
date of March 1, 1995, as amended, is hereby further amended as set forth below.

WHEREAS,  Sprint and Bridge have  previously  entered into an Agreement  for the
provision of managed network services; and

WHEREAS, Sprint and Bridge desire to amend the Agreement.

NOW THEREFORE, the parties mutually agree to the following:

1.       Attachment B.  The following changes are hereby made to Attachment B:

         a)    DOMESTIC  PRICING Section I. Equipment - Purchase Price.  Add the
               following equipment to the list of equipment.
<TABLE>
<CAPTION>

          Model                 Description                       List Price           Net Price
          -----                 -----------                       ----------           ---------
<S>                             <C>                               <C>                  <C>
          AE1001010             BayNetworks ANH                   $2245                $1459.25
                                8 Port Router

          88039901              DB25M-DB25F Cable                 $29                  $29
</TABLE>

         b)    DOMESTIC  PRICING  Section I. Equipment - Purchase  Price.  Model
               AE008017 should now read Model AE008023.

         c)    DOMESTIC  PRICING Section I. Equipment - Purchase Price. The list
               price and net price for the Model 7919 BayNetworks Power Cord (2)
               should now be N/C.


         d)    DOMESTIC  PRICING  Section I. Equipment - Purchase Price Note 4.)
               Add (1) T-Connector.


          e)   GLOBAL  PRICING  Section III.  Pricing for Canada.  A - Equipment
               Installation.  Price  should now be * per site.  Delete the words
               "and configured" from 2).

* CONFIDENTIAL TREATMENT REQUESTED
Bridge/Sprint Confidential               -1-                            11/21/96

<PAGE>

         f)    GLOBAL  PRICING  Section III.  Pricing for Canada . B - Equipment
               Maintenance/Management. Delete this entire section and insert the
               following  language:  "Equipment  Maintenance  and  Management in
               Canada are the responsibility of Bridge."

2.       All other terms and  conditions of the  Agreement  shall remain in full
         force and effect, except as expressly stated herein.

IN WITNESS WHEREOF,  the parties have executed this Amendment Six as of the date
of the last signature below.

SPRINT COMMUNICATIONS CO., L.P.                BRIDGE DATA COMPANY

/s/ George Putney                              /s/ Robert McCormick
-------------------------------                ---------------------------------
Signature                                      Signature


George Putney                                  Robert McCormick
-------------------------------                ---------------------------------
Printed Name                                   Printed Name


Branch Manager                                 Executive Vice President
-------------------------------                ---------------------------------
Title                                          Title


12/05/96                                       12/06/96
-------------------------------                ---------------------------------
Date                                           Date



Bridge/Sprint Confidential               -2-                            11/21/96