Home wireless 2003 server

I've a small home network, Win2003 server running wired. Two other p.c.'s
also running wired can 'net use' to the server. My laptop (win xp pro) can
'net use' to the server when using a wired connection, but on wireless the
server does not respond. Laptop to other p.c.'s works fine, wireless or
wired.

Am I missing a service running on the server?

Thanks!

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