Hi,
A computer running XP Home Edition allows a maximum of 5 other
computers to connect to its shared resources simultaneously. A
computer running XP Professional allows a maximum of 10 other
computers to connect to its shared resources simultaneously.
Computers that aren't actively connected to a computer's shared
resources don't count against the limit. When a computer disconnects
from a shared resource, it no longer counts against the limit. See
this site for more information:
Inbound Connections Limit in Windows XP
http://support.microsoft.com/default.aspx?scid=kb;en-us;314882