The question does remain, why isn't it possible that the computer or domain ID might be repeated? This number is calculated when the computer is installed and uses unique information in the calculation to ensure that the number is unique. Of course, there is no 100% guarantee, but the algorithm has been evaluated by those more mathematically knowledgeable than me, and they seem satisfied. You should also understand that some older server mirroring/cloning technologies did not change the SID, and we did see the problem you are envisioning -- duplicate SIDS, when people used them to create multiple clones of a single install.
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