Multiboxing
From ISBoxer
Multiboxing is playing multiple characters together in a multiplayer online game like EVE Online, EverQuest, Lord of the Rings Online, RIFT, World of Warcraft and many other free and pay-to-play games.
The term multiboxing comes from referring to a PC as a "box", with the traditional method of multiboxing being a couple of PCs side-by-side with their own monitors, keyboards and mice.