HANDLE UnlockData(dummy)
The UnlockData macro unlocks the current data segment. It is intended to be used by modules that have movable data segments.
dummy
This parameter is ignored.
The return value specifies the outcome of the UnlockSegment function. It is zero if the segment's lock count was decreased to zero. Otherwise, the return value is nonzero.
The UnlockData macro is defined in WINDOWS.H as follows:
#define UnlockData(dummy) UnlockSegment((UINT)-1)