Ah, but that's a cunning Fruit Bat /\0/\ solution!
I bet the average user (and that means me!) couldn't work around that problem.
Anyway, thanks to you both for the answer to my question. I'm very surprised that the recovery disks could be used on any computer (and I don't honestly see why limiting the user to one set of disks is any kind of solution to piracy), but I have the answer to my question.
Many thanks again.
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