Info about a Trick (100-Item List)

Hey everyone, I've been looking at a trick for several months now that I'd like to add to a routine. The trick in question is the "list of 100 things" effect, where the spectator chooses a number, and it turns out to be exactly what the magician had prepared. I'm guessing it's done using a Force. I'd love some info on where I can get it – if it's an external app or something else. If anyone could shed some light on it, even without giving away the secret, I'd really appreciate it. I'm just looking for information. Thanks a lot!