Yes
If you have xbox then you need an xbox live account or if you have PS3 you need a PSN account. Then go on multiplayer and select play online.
You need the game in the PS3 to play it online, then it is an option available if you are also able to go online
If for Xbox 360 you need an Xbox Live account, for PS3 you need a PSN account, and for both you need the internet connected to the console.
no
modern warfare, wii, controllers, tv. tard
dude, you need a hard drive just like a moniter needs a computer
No, Only on Xbox Live. But to play online on PC, you need to be connected to the internet.
no
Pretty good but you need internet connection to play online if you really want to fully enjoy the game.
Depends which modern warfare game you mean if its the first one you cant play co-op but on modern warfare 2 you can play with another person but only on special ops. You will need to get a second controller, use system link or play with people online(Xbox live/PSN).
No you need the same game to play against someone