There are 3 lights connected, 2 in one room and the third at the bottom of the stairs. There is a 3-way at the top of the stairs and another in the room with the 2 lights. This guy would like to also be able to switch off just the 3rd light at the bottom of the stairs. I did not dig into this too far but it appears the load, 3 lights and 2 switches are tied into one box. I can't throw in a single-pole before the 3rd light because he would like to turn it on/off from the other 2 locations as well.