Soz dude, but I've got to say this is kind of a stupid post. You clearly don't know anything.
aIW is an abbreviation for alterIWnet that is an alternative IWnet
The mod you have is a mod you load with a program called MW2 Liberation that will get you banned.
Don't just make a profile for this forum and post. Try googling hte things you have found since you don't even know what it is...
Can't some admin give this guy a special rank for this post.