How do flight simulators that run RC helicopters from a computer work?

I noticed that there was a project by MIT to fly RC helicopters from a computer. It seems they connected the controller to the computer and ran a program to automate the flight of the helicopter from the computer instead of from the analog controller.

interface

http://www.milehighwings.com/

ASW28 Radio Control Glider. 2mtr RTF (Ready To Fly) EPO Foam

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