[superb]

Well, you would need to use RARP I believe to retrieve the node's MAC address. So theoretically I suppose when you log into RC, the system could send a RARP request to your system, your system would reply with the MAC address, and if it doesn't match the MAC address that has been set by the administrator, it could deny access. This would work well I think, but unless you added multiple MACs you could only use RC from one node. But here's the problem...it's not feasible to do this because I don't believe dialup users have MAC addresses for their modems. I could be wrong, but I'm pretty sure modems lack MAC addresses.