usactive (USHORT)

      Active indicator.

      TRUE

        The window is being activated
      FALSE
        The window is being deactivated.

      hwnd (HWND)

        Window handle.

        In the case of activation, hwnd identifies the window being activated. In the case of deactivation, hwnd identifies the window being deactivated.

      ulReserved (ULONG)

        Reserved value, should be 0.

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