Turn motion on and off with the buttons at the bottom right of the applet (just above this text). The slider controls the speed of the robots. Bothered that at high speeds the robots go right through one another? Then pick a lower speed. When the simulator is stopped, you can drag robots and lights from the palette into the arena. Dragging a light or the middle of a robot moves it. Dragging the end or corner of a robot turns it. Dragging lights or robots out of the arena deletes them. Just drop them someplace in the applet if you’re using Netscape.