Didn't know about that, that's pretty cool. Have you tested it out yet? I'm kind of curious if it works better than Fraps.

How could you guys not know this? This is basic knowledge in the Steam commmunity. All games that use the Valve console have the capability of recording demos. They serve lots of purposes. Competitive clans will watch demos of other teams to see strategies, etc. When film recording you can use the demo smoother which allows you to pan a camera around in the demo for some cool shots. You can record a demo in every game and just go back using fraps to record the good parts for your video, etc. It's different from fraps because it doesn't use any resources so it won't lag you at all. It's not an actual movie file though. As in you have to actually own the game and be in it to watch it... until someone records it.

quote Lorx

_Because not everybody goes through the list of hundreds of server commands when they get a Valve game

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The record function doesn't record everything as a movie, it records what all the objects are doing, so you can watch later. You cannot view these 'movies' using any type of media player, or convert them. They are not video files. You could use Fraps to make video files, fut the upside to using record is it does not cause any lag.

Actually, although using the technique above does not create a video file, you can create one (an AVI) by typing startmovie "moviename" avi. It will go through the whole movie, but with some lag. This is normal. When it has finished, type endmovie. Then you can open it in a media player, all you have to do is find it in your game folder.

I may have missed some stuff, but here's the video tutorial: http://www.youtube.com/watch?v=s41lcCTs6CQ&feature=related