It depends in Call of Duty 3 you can, but in call of duty 4 and world at war you cannot.
iv seen my friends do it all the time not on world at war but on COD4
Yes, you can play cooperatively with a buddy over Xbox live, or on the same Xbox.
xbox live
no, you only need xbox live if you want to play online
no you can play single player to.
No but you can play single player
You can play single player zombies without Xbox Live, but you can't play online with other players unless you have Xbox Live.
Yes
You can no longer play original Xbox games on Xbox Live.
No
only 2 except on xbox live
usually you just press on multilplayer then xbox live and it should be searching for a player or players it depends Wat game Ur on
You can play it while signed into xbox live, but you cant play with other people through xbox live on oblivion.