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The LUID structure is 64-bit value guaranteed to be unique only on the system on which it was generated. The uniqueness of a locally unique identifier (LUID) is guaranteed only until the system is restarted.
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typedef struct _LUID { DWORD LowPart; LONG HighPart; } LUID, *PLUID;
LowPart: The low-order bits of the structure.
HighPart: The high-order bits of the structure.