Possible returns from WinGetLastError

PMERR_INVALID_HWND (0x1001)

An invalid window handle was specified.
PMERR_INVALID_FLAG (0x1019)
An invalid bit was set for a parameter. Use constants defined by PM for options, and do not set any reserved bits.
PMERR_HRGN_BUSY (0x2034)
An internal region busy error was detected. The region was locked by one thread during an attempt to access it from another thread.

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