hybrid8: Other than checking on player name to distinguish players, it would (I suspect) also be possible to identify individual players based on their hardware address

In the ugly-but-doable department (sorry if this has already been thrown out and I missed it), one cheap way to do some of this (say if you're talking about a single local subnet) would be to set a script to progressively ping across the entire network address range and pipe an arp -a to grep for your MAC address. Script exits the ping loop when it finds the desired match and cats the IP address back to /etc/hosts.

Any help? (Someday I'll learn sed/awk for this kind of stuff!)