Virtualization and emulation
Virtualization is a technique that provides the ability to partition hardware in a way that allows more than one operating system to run simultaneously. Each instance of the Operating System and its applications run on the native hardware (instructions are executed natively by the CPU). In contrast, emulators model a CPU and other subsystems in software so that the actual hardware only runs one instance of the Operating System and the emulator itself.
(Submitted by Flavio Villanustre Thu Jun 2, 2005 )
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