No you can't.
Yes, there is online multiplayer on Call of Duty 4: Modern Warfare.
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.
Call of Duty World at War, Modern Warfare, Modern Warfare 2, Black Ops, and Modern Warfare 3 all have online multiplayer.
U go to multiplayer if no multiplayer u beat
Yes You Can
no, but there is call of duty reflex, a remake of CoD4 with multiplayer.
no , but call of duty modern warfare reflex (cod4) has
Sadly no.
No. There is only Nintendo WFC.
Multiplayer is free.
There are a total of 70 levels (ranks) in Modern Warfare 2 Multiplayer.
I would say that Call of Duty: Modern Warfare 2 is better, because of the weapon selection, perk selection, graphics, gameplay - both multiplayer and singleplayer storyline, the killstreak reward selection, the offline multiplayer class customization feature, and the online multiplayer gameplay. Everything about Modern Warfare 2 is better. Except the price.