PJ2,
Understand your response.
that airliners can be "taken over" by ACARS or ADS commands through the FMS directly controlling the flight and engine controls, autoflight on or off)
If this was possible, would post how to do it in an online public forum?
Think about your autopilot controls, there is a button on the yoke, and several other ways to control the autopilot. Can the autopilot disengage itself?