The statement seems vague, I assume you have them all connected to the network already and are running into Windows XP Pro and presumably vista / 7 limit of maximum connections to the system for Print / file sharing. The limit is 10, and there are a few things you can do to mitigate this: http://support.microsoft.com/kb/122920/
check that URL and do a little googling. I've ran into this in ONE scenario but abandoned trying to get around it as there was a server on my network i could use for the task which doesnt have this limit. You can TRY to use the patcher I found out there, but being as it is a corporate environment I was in and servers are available I didnt give it a chance. Seemingly if you patch tcpip.sys in Windows XP Pro, you can go around this limit. Use at your own risk, I have never tried this: http://www.lvllord.de/
that site has the patcher. Good luck.