WM_SETFOCUS Field - usfocus

usfocus (USHORT)

Focus flag.

TRUE

The window is receiving the focus. hwnd is the window handle of the window losing the focus, or NULLHANDLE if no window previously had the focus.
FALSE
The window is losing the focus. hwnd is the window handle of the window receiving the focus, or NULLHANDLE if no window is receiving the focus.

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