yes you can play 2 players online on world at war on the same ps3 screen
The Wii version of the game does not allow you to play co-op online. How ever the game does allow the players to play a squad mate co-op mode during campaign which views both players through the same character.
No. PS3 and Xbox has different servers.
Sadly no, Battlefield 2 is a one person game aside from the online play.
It more about whether the Game has online co-op play. If it does then two players can play online on the same PS3. For most games they are single player and not co-op either online or offline. An example of a game that is able to have both co-op and co-op online play is Resistance 2 see related link
yes normally you can play up to four player on the same xbox360 on-line
yes, if both the players are on the same team.
You cant. You need to play online against other players and you get promoted to new levels. You can, however, play combat training against computer players and get promoted the same way as you do online, but combat training and online are separate.
In a single player game you can not play split screen or 2 player on the same console even if it is a multiplayer online game
Yes, if they join the same server or are on the same LAN / Hamachi-esque setup. :)
No. In the first 6 Call of Duty games you can only play alone online, but in Call of Duty: Black Ops you can play split-screen online, but you can maximum be 2 players. Offline you can play with up to 4 players.
It depends on the game, but in most games only one person at a time can play online per platform or console