good to see you, sir. walk us through the process that starts on tuesday. >> reporter: well, craig, this is one of the oldest traditions in the catholic church and nothing, not much, really has changed in hundreds of years. so what's going to happen? on tuesday morning, 10:00 local time the cardinals will attend mass in st. peter's square, and there will be the pontefic amass, the pontifical mass and they will make their way slowly to the sistine chapel for the first time invoking the holy spirit. the holy spirit that is officially inspiring them and guiding them through the choice of the best successor to pope benedict xvith, of course, and they'll go into the sistine chapel and it's latin for everyone out apart from the cardinals, of course. the doors will be closed and from then on the cardinals will