the registry stores every USB device you have used along with the Device Name and how many times it is used.
Thanks, this was new to me. Also thanks Kenny for the program.
Edit: Btw, they are listed in the registry under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\USB
Edit2: I wonder is there any similar programs for displays, since i found an entry referring to my previous Compaq CRT monitor under HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Enum\DISPLAY
There's also an entry referring to Samsung display. Never had Samsung, but this computer must be connected to it, when this computer was built-up in a store and they tested it.