In deathmatch and cooperative modes an extra program called a device driver by the Doom documentation handles some of the multiplayer specifics and passes any parameters to the main executable. Many parameters that affect in-game behavior require warping through -wart, -warp, -episode, -skill, -playdemo, -record, or -loadgame, or else they are overridden when the user starts a game through the menu. Any number of parameters may be typed in, limited only by the maximum length of text allowed by the interface (for example, a 127 character total in some DOS versions). The command line may be the MS-DOS command line, or any compatible interface, such as a batch file, the command line or target entry in a shortcut's properties dialog box, the Windows Run command, or the command line in DOSBox. The parameters are typed after the executable's name in the command line and are followed by variables or text strings, if applicable. In respect to the Doom engine a parameter (or command line parameter and command line argument) is a start-up indication by the user that the engine should change its default behavior.
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