First off I have never tried any diablo games before except for once at a friends I started the first bit of II's single player and enjoyed it. I know diablo, er at least II anyways, isn't considered an mmo, but it has multiplayer. I was wondering if someone could give me more details on how the multiplayer works and why it isn't an mmo.

I am also wondering if III will have the same multiplayer as II and if there are any differences.