hwndParent (HWND) - input

      Parent-window handle for which the active window is required.

      HWND_DESKTOP

        The desktop-window handle that causes this function to return the top-level frame window.
      Other
        Specified parent-window handle.

      hwndActive (HWND) - returns

        Active-window handle.

        NULLHANDLE

          No window is active
        Other
          Active-window handle.


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