I found out that u can just look down at the bottom left hand corner when u have a unknown game in the system.
Dont go to wiki awnsers for some games because some IDs are wack. They make your actin replay go nuts, loose all your games, and u cant put any more on there. (take my opinion i had that happen to me once and i had to get a new action replay.)
Go to google to look up game cheat coads, or just go to a website that u know u can get good and non bug-a-fied cheats. I think that the website on the box is the best. So to phrase this, dont go to wiki awnsers for game IDs or cheats, google any thing u need, and game nut is a great store to find action replays and games.