I haven’t seen it in action, but from what I understand there’s a method with hunters (and maybe locks) where the low level tags the mob, and the pet kills it. I’d also like to know more definitive information about actual in-game mechanics.
Hopefully someone else can post some detailed clarification.
Software multiboxing isn’t against ToS. The BattleNet Client supports software multiboxing. There also isn’t a “ToS,” but a EULA.
Mirroring keystrokes to multiple clients is an issue.