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based on an earlier version of the Wolfram Language.
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$BatchOutput$Display

$SessionID

FilledSmallSquare$SessionID is a number set up to be unique to a particular Mathematica session.

FilledSmallSquare$SessionID should be different for different Mathematica sessions run either on the same computer or on different computers.

FilledSmallSquare The value of $SessionID is based on $MachineID, as well as AbsoluteTime[ ] and operating system parameters such as the Mathematica process ID.

FilledSmallSquare See The Mathematica Book: Section 2.6.3 and Section 2.13.5.

FilledSmallSquare See also: $ModuleNumber, $ProcessID.

Further Examples

$BatchOutput$Display