There are hardware devices (personal firewalls) that allow you to CHANGE the broadcasted MAC address on the fly. If I installed one of those in my dorm at MIT, and kept changing and re-registering my new MAC addresses, I would have, theoretically, obtained multiple IP addresses also. Or, better yet, I could just change my broadcasted MAC address to one that I know is already registered. Viola - I'm now "using someone else's computer" without physically doing so.
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There are hardware devices (personal firewalls) that allow you to CHANGE the broadcasted MAC address on the fly. If I installed one of those in my dorm at MIT, and kept changing and re-registering my new MAC addresses, I would have, theoretically, obtained multiple IP addresses also. Or, better yet, I could just change my broadcasted MAC address to one that I know is already registered. Viola - I'm now "using someone else's computer" without physically doing so.