1. A system comprising: a display; a vision-tracking device that signals whether a user's gaze is directed towards a target area; a speech processor that converts the user's speech into electronic command signals; and an interconnection between said vision tracking device and said speech processor that enables said speech processor to output the electronic command signals only when said vision-tracking device signals that the user's gaze is directed towards the target area, wherein the target area is located on a predefined area of the display.