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Demo

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With few exceptions, demos can only be played back with the same versions of the Doom [[IWAD]] and executable or [[source port]] as those used during recording. If a demo is played on a different source port, using a different [[WAD]](s), or even with a different version of the same source port or IWAD, it may refuse to run, or the actions of the player in the demo may become nonsensical, with the [[Doomguy]] crashing into walls and shooting apparently at random. This is known as a "desync", and indicates that the demo is not compatible with the playback method being used.
Display commands not affecting gameplay, such as chat text and the IDDT [[Doom cheat codes|cheat code]], are not recorded in a LMP file and may be used freely during playback. However, other cheat codes are not recorded either, and will almost certainly corrupt the demo if used during recording, or cause a desync if entered during playback.
Many of the demos on the Internet are of version 1.9 format, because it marks the final versions of the games. Older versions are rarer, as the engine versions they were recorded with are obsolete and did not have as much exposure to dedicated players over time. The [[idgames archive]], for example, purged a number of older demos at one point, keeping only demos of the latest version. Additionally, this is the format used in [[Compet-n]], the premier speedrunning site for demos in the original levels of the games. Newer demo sites do include a good number recordings for source ports, however, especially of levels from user-made [[PWAD]]s.
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