1. A system for controlling an electronic device, the system comprising: a microprocessor running control software for: receiving a first signal indicative of a facial expression of a user; receiving a second signal indicative of motion or position of a part of the user's body; and generating a motion command for moving an object of interest on the electronic device based on the second signal; and a communication link for transmitting the motion command to the electronic device; wherein the control software: detects an active facial expression based on the first signal; starts generating the motion command when the active facial expression is detected for at least a first minimum time duration; and stops generating the motion command when the active facial expression is no longer detected.