From: Brian Candler <b.candler@...>
Date: 2009-01-13T18:13:34+09:00
Subject: Re: Unique identify computer (both Windows and MacOSX)

Pascal J. Bourguignon wrote:
> If Internet connectivity cannot be assumed, then you would have to
> build a unique ID trying to gather specific data and random data to
> reduce the probabilities of a collision.  There are several web pages
> indicating how to build such an ID.

There is a uuid gem too.

> The point is that the specific
> data about the computer is gathered only when the ID is made, not when
> it's used.  If you change your hardware configuration, or move your
> "OS" to some other hardware, you should be able to keep your ID.

But if you store it on the hard drive, then the uid moves with the hard 
drive. If you backup and restore to another machine, then you will have 
two machines with the same uid.
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