WM_PSETFOCUS Field - usfocus

usfocus (USHORT)

Focus flag.

TRUE

The window received the focus. hwnd is the window handle of the window which lost the focus, or NULLHANDLE if no window previously had the focus.
FALSE
The window lost the focus. hwnd is the window handle of the window which received the focus, or NULLHANDLE if no window received the focus.

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