"View Workgroup Computers" is missing from "Network Tasks"

[Helpless in Seattle]

I have three computers (2 laptops) connected in a wireless home network.
Both laptops can wirelessly print to a printer connected to the desktop. The
desktop and laptop A can share files but neither can "see" Laptop B. On
Laptop B when I go to MY NETWORK PLACES, the task VIEW WORKGROUP COMPUTERS
does not appear under NETWORK TASKS.

All three computers are running Windows XP Pro SP2.

How do I get VIEW WORKGROUP COMPUTERS task to appear. I assume (read: hope)
that solving that issue will allow all three computers to "see" each other.

Thanks, in advance, for any insight.

 

[Mark L. Ferguson]

The one with the printer has set 'file and print sharing' protocol, and the
others have not.
start/run, type:
HH mkMSITStore:%windir%\Help\network.chm::/hnw_ipx_fileandprint_sharingw.htm