5.210 USN_VECTOR
The USN_VECTOR structure defines a concrete type for the cookie (section 1.3.2) used to pass state between calls to IDL_DRSGetNCChanges.
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typedef struct { USN usnHighObjUpdate; USN usnReserved; USN usnHighPropUpdate; } USN_VECTOR;
usnHighObjUpdate: A USN.
usnReserved: A USN.
usnHighPropUpdate: A USN.
The USN_VECTOR type, as shown, is used in the DRS IDL. However, only the size of USN_VECTOR (24 bytes) and the representation of its null value (24 zero bytes) are standardized for interoperability.