Dunno about 64, but XP has a limit of 10 connections over a network to any port. This was MS's way to stop people from using it as a server. I guess you could listen on as many ports as you want, but only be able to respond to requests on 10 at a time. (pretty sure it's 10, could be wrong though)
Yup, 10: http://support.microsoft.com/?kbid=314882
-- Stuart
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