XP Home/Win-7 Wireless Problem

I wrote:

>I have a mixed home network XP Home/Windows-7. All can be set up for either Ethernet or Wifi.>
>
>Activating wifi on the XP Home machine yesterday, the Internet was available to both the XP Home >and Win-7 machines.
>
>However, with wifi Windows 7 could not see the XP machine while the XP machine could see the >Windows 7 shares. Disabling wifi and enabling Ethernet brought everything back to normal again. >Strangely Stardock Multiplicity (a mouse/keyboard-sharing application) worked perfectly.
>
>What hadn't I set up correctly?

Wrong forum again !! I keep getting into the wrong forums.

Thanks for your replies !!!!
-----------