DocumentationMathematicaBuilt-in FunctionsSystem InterfaceSystem Parameters
$MachineID
$MachineID is a string which gives, if possible, a unique identification code for the computer on which Mathematica is being run.
On many computers, $MachineID is the MathID string printed by the external program mathinfo. See Section 2.14.5. See also: $SystemID, $MachineName. New in Version 2.
$MachineID is a string which gives, if possible, a unique identification code for the computer on which Mathematica is being run. 
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