Nope.
you cant play against people on other systems. the console makers wont agree to share servers and players (customers)
yes you can
No, you can do offline solo/split screen or online with three other players.
I'd say Call of Duty 3 because there is no online mode so he won't be harassed by other players. Also the language won't be as offensive in the regular game as it would be online with other people talking to him.
4 players
A server allows the game to be played online with other real players.
offline:4 players online:50 players
Up to 4 players locally and up to 24 players online
If you mean people on different consoles...... nope..... !?!
In Call of Duty: Black Ops 2, players cannot directly check or access other players' online vaults. Each player's vault is private, containing their personal game clips, highlights, and other saved content. However, players can share their clips or provide links to them, allowing others to view specific content if the owner chooses to share it publicly.
The objective of the popular Call of the Warlords online strategy game is that players must rebuild cities and economies, fight battles with other players, with the ultimate goal being to retake the Imperial Throne.
i believe 367458,7858695846795,984756843567.