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Tools
Multiboxing may be as simple as running two instances of the game on one computer (each logged in to a separate account) and switching between them.[1] Players may also use multiple computers, each with their own keyboard and mouse. This quickly becomes impractical with an increasing number of computers, so a keyboard multiplexer may be used, which sends the signals from a single keyboard to several computers.
Software tools may include programs which can send keystrokes to different instances (simulating keyboard multiplexing) of the game, even across networks, or voice command software.
Often, heavy use is made of the macros built into the game's default interface. This allows more complex instructions to be issued with a single keypress. Examples include targeting a certain character and healing them, or firing a spell at another character's target. [2]
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Compatibility with Game Rules
Multiboxing is generally allowed by MMORPG End User License Agreements, because the characters are still subject to all the normal rules of the gameworld and are controlled by the player directly. However, when combined with bots that partially or fully control the characters, it would be against the terms of service of most online games. [3]
Most MMORPGs only allow a single character per account to be logged in at once, so multi-boxers need a separate account for each character they want to play simultaneously. In subscription based services, this means paying multiple monthly fees, and buying several copies of game expansions.
