A demo in City of Heroes is an in-game recording made via the /demorecord Slash Command. The demo feature allows you to make recordings of your gameplay and use the game engine to play back those recordings. The recordings created this way are not actual video documents, but simply text files with a record of all the commands, models, effects, and animations that tell the game engine how to render the recorded demos. Because the demo files are just text files, demo recordings can be edited with any text editor, or with player-made tools specifically designed to manipulate demo files. This gives you the ability to modify demo recordings (or even create them from scratch) to make custom "movies" for playback via the game engine, allowing situations and events which may not exist during actua