Couldn't you just do a tcpdump on port 5353 (MDNS) to see what machines show up? Then you could poke around on each of those machines and see what services are being offered. Or, if you know you are looking for iChat via Rendezvous, then tcpdump on those ports to see which machines are talking. You'd want to make sure that tcpdump doesn't violate any network policies, though. (I've lost track of whether the original poster was a net admin or not.) My other thought was nmap, which isn't installed by default, but can be installed via fink. It's a bit much, though. It can also probably get you fired if it violates your network policy, so beware. ^_^; gretchen