Thanks guys. So if I'm understanding- in coop mode two or more people play single player-type missions together (working as a team to complete objectives). And this is important to me, it is done over a network or the internet? This is to be contrasted with multiplayer where everyone plays against each other like in Deathmatch.
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Co-operative IS multiplayer. Just like DM, Capture the Flag, etc. are multiplayer. The difference is that you are working together on the same team to achieve a common goal instead of fighting against each other. It can be done over LAN or the internet... just like any other multiplayer... provided the game supports it.
I don't know if you remember the game Commandos: Behind Enemy Lines... but that game is an excellent example of co-operative multiplayer over the internet.
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