Players record their fastest level run-throughs in real time as demos, which keep track of each movement and action taken by a player in completing one or more levels. The demo format then allows the speedrunner to send his run-through to other Doomers, who can view it on their own machines and compare it to others. A player who believes his or her demo to be one of the fastest ever recorded, at least with a particular map(s) and in a particular category, can submit it to a competitive speedrunning site (such as Compet-n) for verification and posting.