no but black ops does
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You can't, modern warfare 2 has only one player online but it has splitscreen which is only local play.
There is no way to get new guns on the splitscreen mode the guns and perks that are on the splitscreen mode are the only ones that you can use.
Call of Duty World at War, Modern Warfare, Modern Warfare 2, Black Ops, and Modern Warfare 3 all have online multiplayer.
There are no cheat's for modern warfare 2 only hacks and glitches, modern warfare 2 was made mainly for multiplayer and there are no cheats because they do not want everyone to have a massive advantage over everybody else.
It does worki have a ps3 with modern warefare 2 and the split screen and the online multiplayer work finemaybe your ps3 is not connected to the internet?