Undocumented Startup Parameters – Arma 2
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Configuration & Performance
noland
Disable procedural terrain generation.
Graphics
forceDX9
Self-explanatory.
window
Run game in windowed mode.
y
Specify rendering height.
x
Specify rendering width.
Sound
XA2Sound
Use XAudio2 sound engine. (Default)
Network & Multiplayer
noESRB
Gets rid of ESRB warning when clicking Multiplayer.
noPatchCheck
Disables check for newer patch on MP server select screen, disabling nag.
session
Unknown.
privateSlots
Unknown, may set aside MP slots for local connections only.
bandwidth
Self-explanatory, but usage unknown.
gamertag
Microsoft Gamertag. I doubt this does anything, it is a remnant of the Xenon code.
Development
sm2
Use Shader Model 2.
sm3
Use Shader Model 3.
disableShaderGeneration
Self-explanatory.
generateShaders
Self-explanatory.
Unknown
worldCfg
Unknown.
noLauncher
This may have something to do with the shell association introduced in 1.05.