For example for harddisks. You usually want them to be mounted in the same
directory. Or if you have several printers of the same type connected your
computer you need a way of identifying them. Or for ethernet adapters:
because each is connected to a different network, so you need to assign
different IP addresses to them.
Actually most USB harddisks, printers and network adapters have unique serial
number (you have to be careful though as some claim to have a serial number,
but it is not unique).
bye...
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