a laptop is theoretically possible but practically is impossible. We don't have any static IP's here to be associated with our machines. Even though, don't think that any will go to Dos_Command Prompt to type ipconfig /all to get that number and save it.

Second thing, if this guy never connect to the internet ... then we got a lot case here. Most of the laptops got a built-in NIC which means changing the NIC is impossible. What if this guy would use a wireless USB to connect? Means every time he will pass it to another laptop or machine ... we will get a different MAC-Addresses ...

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Do not dwell in the past, do not dream of the future, concentrate the mind on the present moment. (Gautama Buddha)