The unique id for a system is the computer name + UUID. How ofter do you rename a PC ? If it is renamed, is it re-imaged ?
If I use UUID, on white boxes it causes problems. They are often not set, set as all F's, etc, etc.
If I use MAC Address, these change. Think virtual machines. Think multiple NICs, etc, etc.
If I use hostname, these change.
The idea was to get something that was both (relatively) static and unique. Hostname + UUID for most people will be a unique combination.
I have found when a PC is renamed, it is usually also reimaged. In that case (in my opinion) it IS a new PC. You can use the "export system details" report to extract the old data, then reimport it after the "new" system has been audited.
Again - are you renaming PCs often enough that this is actually an issue ? I'd be interested in your use-case for that. It may just make me change how I uniquely identify a system...
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