Within a computer, one or more smaller 'virtual computers' can be nested. These are called 'virtual machines', and they can be used to run alternate operating systems, or provide a task-specific work environment. Virtual machines are initiated and managed by a program that oversees the process, known as a hypervisor. As well, a virtual machine can be initiated from another virtual machine, and there is technically no limit to how deep nesting can go (although realistically finite memory will eventually put an end to the fun).
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