I'm assuming that you don't mean how many computers can be on a home
network
as your subject line implies. Bandwidth and hardware considerations aside,
I believe you can have up to 256 (guessing as to the exact number). Of
course you would never want to do this; more than 7-8 machines on a
Workgroup network with a "pseudo-server" and you should be looking at
running a real server.
I think you are possibly referring to the inbound concurrent connection
limitations. Note that the limitations are on *connections* and not on
*computers*. Each computer can, and often does, make more than one
connection.
Refer to "Device Connections" in the License Terms for Microsoft Windows
Vista. For more information please see:
http://www.microsoft.com/about/legal/useterms/
Inbound connections limit in XP -
http://support.microsoft.com/?id=314882
5 - XP Home/Vista Home Basic
10 - Vista Home Premium/Vista Ultimate/XP Pro
49 - SBS 2000
74 - SBS 2003
Unlimited for full Server O/Ses
Malke