Re ly:
The virtual machine mentioned by Climbing refers to third-party software like Virtual PC or VMWare that completely virtualize the entire computer, which must be installed separately. Specific information can be found from this forum or search engines.
In fact, virtual machine is a concept with a wider scope. Generally speaking, software or hardware that can provide a simulated software or hardware platform for certain programs can be called a virtual machine. For example, CMD under WinNT/2K/XP/2003 is a DOS virtual machine based on Microsoft's writing. For another example, the interpretation environment in which Java class codes run is also called a Java virtual machine. More remotely, some PC emulators for arcade games are also typical virtual machines.
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