hwnd (HWND)

Focus-window handle.

NULLHANDLE

No window is losing or receiving the focus.
Other
Window handle.

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.

ulReserved (ULONG)

Reserved value, should be 0.

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