I suspect that the hotel login does register your MAC address, so you would have to figure that out.

I've thought of this same thing before as they always have this extraordinarily short cord that only goes to the desk, when I really want to use my laptop kicked back on the bed or sofa.

It's just much simpler to bring a very long cable with you and deal with it that way (or move the desk halfway across the room, as generally, the cord is only short between the PC and the modem).

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robb is clearly within the margin of sampling error - Googlism