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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.