Tom Clancy's Rainbow Six: Lone Wolf Cheats

There is a glitch in this game which allows you to walk through doors. To do so, walk up to a door and crouch. Walk forward into it, ignoring the fact that you are not going forwards. Now turn around then turn back and you'll find you have walked through the door! Useful for sneaking up on enemies, as they don't notice you if you don't open the door.