Obtaining a unique, "unchangeable" number associated with an SGI workstation

[Andrew Simms]

Some of the folks I work for would like to make a reasonably secure
scheme to insure their product runs only on machines they are
licensed to run on.  To do this, they would like to obtain a
read-only number (such as a motherboard serial number) that
could be used as a key to operate the software only on that
machine.  I know mathematica on the Irises has a program called
mathinfo that generates a unique number but I have no idea
what it does to get it.

If there is sufficient interest, I will be happy to post
a summary of responses emailed to me.

p.s.  Ethernet addresses won't quite do it, since it needs
	to run on machines without ethernet boards.
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  Andrew Simms					ams at acm.princeton.edu
  System Administrator
  Program in Applied and Computational Math
  Princeton University
  Princeton, NJ   08544
  609/258-5324 or 609/258-6227
  609/258-1054 (fax)