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A simulation is a distinguished sub-set of a server's immersive environment.

Basically, just as a single server can run several websites in this day and age (e.g. [http://wildcard.thorngale.net Wildcard] and [http://sehto.pinkgothic.com Sehto] both running on the same physical machine in different folders), a server serving immersive environments may have several wholly independent worlds available.

In Sanctuary and many other multi-simulation hosts, the term Fragment is also used.