How long has mw3 had a screen capture function i have been playing since launch and have only just noticed it .Was it added in a update to the game or did it come with a firmware update ? Are there any other games that use it ?
In-game screenshots were added in Oct 2008 with FW2.50. Not all games are programmed to use it but MW3 has been since launch. I'm sure there's plenty of games that you can use it with but the only other one i can think of right now is Modnation Racers.