This isn't a bot. Its basically a clone of AOL Instant Messenger with more reliable servers, and a different protocol. And yeah, it utilizes the whisper system.
Battle.net servers are more reliable than AOL servers? Hah! I beg to differ.
Yeah, I don't know where I was going with that. =p
But yeah, theres.. 64 of them (16 machines per DNS, IIRC) in four locations, compared to whatever AOL has in one. Not to mention that theres TestBNCS and PvPGN, which haven't been done with AOL's protocol.