The control panel chair button or the keyboard S key freeze the player in place while the robots move repeatedly until either all robots on the current level are destroyed or until a robot catches and kills the player. It's a convenient way to finish off a level without much effort. Use this only when you are sure that you are in a safe position where it is impossible for any of the robots on the current level to reach you because you can't stop it once it starts. This is equivalent to the 'sit and watch' or 'last stand' command in the original Robots game.