sxMouse (SHORT)

      Pointing device x-coordinate.

    syMouse (SHORT)

      Pointing device y-coordinate.

    uswHitTest (USHORT)

      Message result.

      Zero

        A pointing device capture is currently in progress
      Other
        The result of the WM_HITTEST message.

      fsflags (USHORT)

        Keyboard control codes.

        In addition to the control codes described with the WM_CHAR message, the following keyboard control codes are valid.

        KC_NONE

          Indicates that no key is pressed

        rc (BOOL)

          Processed indicator.

          TRUE

            The window procedure did process the message.
          FALSE
            The window procedure did not process the message.

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