Multi-boxing
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Multi-boxing (dual-boxing or two-boxing for only two characters, the most common type of multi-boxing) is a term used mostly in MMORPGs to refer to playing as multiple separate characters simultaneously. This can either be achieved by using multiple separate machines to run the game or by running multiple separate instances of the game. By itself, it isn't considered cheating because it is difficult to control multiple characters at the same time, but it is sometimes combined with bots that partially or fully control the characters.