I've prepared a Call of Duty 2 Demo Tweak Guide to provide descriptions of the in-game settings, as well as a range of advanced tweaks including full details of the major command variables you can use in the console. However the best use of this guide is for those who want to see whether they can tweak the game to achieve a good level of image quality vs. performance on their machine, allowing you to work out whether you need to upgrade for the full retail version, or indeed whether it's even worth buying the game if it performs/looks poorly on your machine.

TweakGuides