Call of Duty World at War, Modern Warfare, Modern Warfare 2, Black Ops, and Modern Warfare 3 all have online multiplayer.
Infinity ward has not developed a way for 2 people 2 go online for any console, you can play split screen together but online no
No.
Play online
You can't, modern warfare 2 has only one player online but it has splitscreen which is only local play.
Just go online and play a game mode... you'll be playing with multiple players.
Millions.
i dont no!
Two players on one screen. Ten players online.
i have tried this my self, you cant sorry.
cap of 9 vs 9 on multiplayer online
System Link
You can play online using the Nintendo Wifi Connection. It allows up to 10 players per game.
If you are reffering to the cooperative missions also known as co-op then no, it has been confirmed that Modern Warfare 3 will not have a co-op component.
You obviously have to pay for the game, but there are no fees for playing online.
In my opinion, you should hold on to the other games if you can, but more people will be playing on the newer games online.
Special-Ops (2 players max) and Multiplayer (Up to 18 players in a single lobby)