docs: def send_PointerEvent(self, x, y, buttonmask=0):
          """Indicates either pointer movement or a pointer button press or
             release. The pointer is now at (x-position, y-position),
             and the current state of buttons 1 to 8 are represented by
             bits 0 to 7 of button-mask respectively, 0 meaning up, 1
             meaning down (pressed).
          """
          self.sendMessage(struct.pack('!BBHH', 5, buttonmask, x, y))