Peer-to-peer and domain

I have an nt server that everyone logs into. I would like to have then connect to one another outside of the network enviornment on a seperate hub. When I do that I get a message that says there is not a server to authenticate the log in. If I then turn around an log in to the machine with a local account I can see the other machines. Is this the only way to do this? each person would in essence have two profiles then right? Can you duplicate them easy enough?