Racks heat up, and every runaway process in the list heats the one it runs on. Type a process name to kill it, and its rack cools down. Above 80° a rack shows a cooling code — type those digits and it is saved. Letters are always processes, digits are always codes, so the first key you press already says what you are doing. The rows marked SYS are system processes: typing one all the way to the end takes its rack down and costs a life, however perfectly you typed it. Read first — Backspace cancels a name you started by mistake.