> On the other hand, ethernet numbers are unique,

Um, supposedly unique.

> So one may attach one or more ethernet numbers to an arbitrary string
> and get some additional degree of uniqueness.

Assuming the machine has one or more ethernet interfaces.

This is also assuming the ethernet address lives in the card (which is
not necessarily the case - Suns, for example, have per-machine ethernet
addresses stored in the "EEPROM", not interface-hardware-known
per-interface addresses).  Admittedly, if the machine keeps its
ethernet address elsewhere, it's probably available even if there are
no ethernets on the machine at present....

					der Mouse

			       mouse@rodents.montreal.qc.ca
		     7D C8 61 52 5D E7 2D 39  4E F1 31 3E E8 B3 27 4B