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LUID (Structures)
 
.
Summary
A 64-bit value guaranteed to be unique only on the system on which it was generated... until the system is restarted.

C# Definition:

[StructLayout(LayoutKind.Sequential)]
public struct LUID {
   public UInt32 LowPart;
   public Int32 HighPart;
}

VB Definition:

Structure LUID
   Public LowPart As Integer
   Public HighPart As Integer
End Structure

Notes:

Why is this defined as two ints instead of a long? As far as I can see there's no need to treat it as anything other than

an opaque 64 bit field

Documentation
LUID on MSDN

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