About a month ago, I started to learn AS3 and I was able to make some simple games so far. But I do not understand however, why Facebook games like Farmville are constructed of multiple files .swf. I understand the point of classes, objects, files like .swc, .as3, .fla, etc..
Can anyone explain or give me an idea of this kind of game? How they integrate and why use so much swf file.