Switch from auto to single shot in battlefield 2142?
Just tap the number "3" again for primary weapon.
I can't update battlefield 1942?
Update? You mean patching it? It shouldn't be hard, just download the Patch, double click, install Done...
What is the sign in code for battlefield 2142 when you are in the game?
You need to go to a video game store and buy the game. Inside the case on the back of the guide book there is the cd-key u need to register the game. You will have to go to www.ea.com and register your game there. You will create an account on the website and with that same account you will go and log into the game after you have installed it.