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virtualcomputer
A virtual computer is a *computer defined as a program for use
on a *PhysicalComputer.
Use of a virtual computer allows easier *portable computing as
programs running on it only require the virtual computer to be
updated to work on new machines.
They are also able to be simpler and cleaner to write and use.
A disadvantge is performance: virtual computers will be slow
compared to the physical hosts they run on.
Examples of virtual computers include *ilo, *nga, and *uxn.