jbn@wdl1.UUCP (John B. Nagle) (05/11/84)
One good serial number is an Ethernet address, where available. Some VisiCorp software available on 3COM EtherShare nets uses this to limit the use of the software to a specified number of machines. The nice thing about this is that while you could change your Ethernet address and make two nodes the same by changing a PROM, if you did, your net would stop working.