It wasn't quite as major as this makes it sound! A couple of inconspicuous wires were run from the 'TV 11' on the MIT-AI KA10 machine (the -11 that ran the Knight displays) into the elevator controller, and run onto the terminals where the wires from the 'down' call buttons on the 8th and 9th floors went. So it wasn't anything major, and there was really no need for her to take the stair (especially 8 flights up :-). The code is still extant, in 'SYSTEM; TV >'. It only worked (I think) from Knight TV keyboards; typing 'ESC E' called the elevator to the floor that keyboard was on (there's a table, 'ELETAB', which gives the physical floor for each keyboard). The machine could also open the locked 9th floor door to the machine room (with an 'ESC D'), and there some other less major things, e.g. print screen hardcopy. I'm not sure what the hardware in the TV-11 was (this was all run out of the 'keyboard multiplexor'); it may have been something the AI Lab built from scratch.