cmd = 0 Select which events are reported by the DEC locator feature.
See also dec locator activate/deactivate.
If cmd = 0 deactivates sending events. Mouse position can still be polled by dec locator report current position.
If cmd = 1 activate reporting of button press events. If cmd = 2 deactivate reporting of button press events.
If cmd = 3 activate reporting of button release events. If cmd = 4 deactivate reporting of button release events.