The question does remain, why isn't it possible that the computer or domain ID might be repeated? This number is...
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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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