Cannot See Networked Computers

One desktop hardwired to network, two laptops (1 and 2) connected wirelessly.
All with different IP addresses in the network (192.168.2.X). THEY ARE ALL
CONNECTED, yet I cannot see them all from the laptops. When I go to the
entire network in Windows Explorer, I can see my network, MSHOME (clever,
huh) and when I'm at the desktop I can see all three computers. But at
Laptop 1, I can only see Laptop 1 -- not either of the other two computers.
When I'm at Laptop 2, I can see the desktop and Laptop 2, but not Laptop 1.
Nevertheless, I can print from either laptop to the printer attached to the
desktop, so I know they're connected.

Pinging is inconsistent as well. I can ping from all three computers to the
gateway, but only some of the time can I ping between Lartop 2 and the
desktop, and I have never been able to ping to Laptop 1 from the Desktop.

Any suggestions?