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A mudlib, short for mud library, is a library of code forming part of the technical infrastructure of a MUD.[1][2] Though different varieties of MUD may be considered to have mudlibs,[3] the term is most often used with LPMuds. In an LPMud, the mudlib consists of interpreted code written in the LPC language, which is interpreted on the fly by a driver. The driver acts as a virtual machine while the mudlib acts as an operating system by defining how the world acts and controlling its processes.[4]

Publicly available LPC mudlibs include:

An example of a non-LPC MUD with a clearly identifiable mudlib is MUME, a DikuMUD that implements global support code in its language Mudlle.


  1. Bartle, Richard (2003). Designing Virtual Worlds. New Riders. pp. 43. ISBN 0-13-101816-7. "Above this layer is what (for historical reasons) is known as the mudlib58. [...] 58For "mud library". MUD1 had a mudlib, but it was an adaptation of the BCPL input/output library and therefore was at a lower level than today's mudlibs. The modern usage of the term was coined independently by LPMUD." 
  2. Busey, Andrew (1995). Secrets of the MUD Wizards. SAMS Publishing. pp. 239. ISBN 0-672-30723-5. "MUDLib is short for MUD library. [...] Files within a MUDLib are akin to books on the shelves of a library." 
  3. Bartle, Richard (2003). Designing Virtual Worlds. New Riders. pp. 45. ISBN 0-13-101816-7. "Everything that is hard-coded constitutes the engine. For MUSHes and MOOs, the engine is just the driver; [...] for DikuMUDs it's the driver, the mudlib, and the world definition." 
  4. Bartle, Richard (2003). Designing Virtual Worlds. New Riders. pp. 43. ISBN 0-13-101816-7. "The mudlib defines the physics of a virtual world, which will include things such as mass/weight, timers, movement and communication, along with higher concepts such as (in a game context) magic and combat mechanisms." 

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