To not play multiplayer on COD 4, just do not select the option for multiplayer.
No, you can't play multiplayer in Call of Duty 3 Wii.
No you can't.
get live and go on multiplayer noob
You can play online multiplayer in Call of Duty 3 for Wii, but you can't play multiplayer in the sense of two controllers on one Wii.
no you can only do it in call of duty 5
I assume you mean COD: World at War, and the answer is yes.
ya, its only on multiplayer/zombies
Unfortunately no, you can't play multiplayer on Call of Duty Modern Warfare 1 or on Call of Duty Modern Warfare 2 on the same screen. But on Call of Duty Modern Warfare 3 and Call of Duty Modern Warfare Black Ops you can play multiplayer on the same screen. There is an new Call of Duty Black Ops 2 coming out soon though, so I expect that to also have that feature, since its newer.
Wifi is needed to play the Wii multiplayer versions of Call of Duty. Other platforms use other kinds of connection. For example, Xbox multiplayer uses Xbox Live. Basically, an Internet connection is required to play multiplayer, but single-player does not require it.
Yes you can
No, you cannot play multiplayer over xbox live while downloading any DLC content.