2003 Server Concurrent connections??

Hello. I am planning to setup a workgroup with 9-11 machines for a restaurant. The Point-of-Sale software we use (called Future POS) requires one machine to act as a server, and then all others will constantly connect to it for info.
I know that Win XP Pro only allows 10 concurrent connections. My question is: If I install Windows server 2003 on the FPOS “server” but do NOT create a domain, and only join it to the workgroup, is there a limit on incoming connections into the server? Do CALs play a role even if there is no domain?

Thanks!!