You can't. Because the sensor bar doesn't allow for split screen games, since each controller would be interfering with each other. So i don't recommend the wii version. It's just a cheap rip off of COD Black Ops.
yes
yes
You can't play with each other on. The same console
nope they can not. i know it sucks right.
no ps3 must play ps3 etc
As long as both players have Xbox Live Gold you can play 2 seperate accounts on the same console on Zombies and Multiplayer.
Two on the same console and four online.
no game can play against other systems. This is partially for the same reason that you can not play a game disc for another system in your console. They are not the same game, but are different versions of the same game
Halo works but I'm not sure of others.
two people can not play together on the same console on Red Dead Redemption.
No, no CoD supports this feature.
nope =D