Plutonium

Can we play MW3 campaign coop ? I saw that game on website and in game info they wrote COOP with plutonium

my and my friend have finished WAW campaign in COOP mode can we add extra missions mod and play together ?if yes how to do that?

Resxt Thanks it worked !

I started a game in campaign world at war LAN mod me and my friend I created private match ,gave him my radmin IP and he connected and entered the game I see him in the game but he doesn't see me. how can we fix that