hwndFocus (HWND)

      Focus window handle.

    usSetFocus (USHORT)

      Focus flag.

      TRUE

        The window is receiving the focus and hwndFocus identifies the window losing the focus.
      FALSE
        The window is losing the focus and hwndFocus identifies the window receiving the focus.

      fsFocusChange (USHORT)

        Focus changing indicators.

        The indicators are passed from the WinFocusChange function.

      ulReserved (ULONG)

        Reserved value, should be 0.

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