Uniquely Identify Machine

[Gaurav Mahajan]

Hi,

I wan to recognize a particular machine uniquely.

I would like to know which attribute of any machine can uniquely identify a
particular machine.
The machine may be a Virtual machine.

Are BIOS information for machine are unique????
Is processor id is unique????


or we can form unique identification number of machine with the combination
of the bios attributes.????



Regards,
Gaurav Mahajan.
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