LUID (Structures)
Last changed: 223.104.45.153

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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:

struct LUID {
   public int LowPart;
   public int HighPart;
}

VB Definition:

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

Notes:

None.

Documentation
LUID on MSDN