I have a Dell Vostro laptop running XP-SP3. It is set up with the same Workgroup ID as my 2 desktops (running Vista and Win2k respectively), and if it is plugged in via an ethernet cable, it can be part of the network just fine.
So why is it invisible (and can't see anything but itself in the network) when it is connecting via Wireless.
At first I thought it must be my network config: I had my wireless router (Asus WL-520GC) plugged in to another router (an old Planet model) which everything else was connected to. Since I have fewer wired connections than I used to, I removed the Planet and plugged everything into the Asus - then rebooted. Still no visibility. Internet is working over the wireless though.