virtual machine : Java Glossary

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virtual machine
Usually the term means the JVM the Java Virtual Machine, the hypothetical machine capable of running byte code simulated by java.exe for various platforms.

Virtual machine can also refer to a way of running several OSes fully simultaneously on the same hardware. You use this feature often to test out new releases of your main OS, or to experiment with other OSes such as Linux, 64-bit versions or to test your software on older OSes such as Win2K and XP, or to run legacy software that only runs on older OSes.

Microsoft provides free software called Virtual PC 2007 to do virtualisation. It even lets you drag and drop to copy files between different OSes running in different windows on your desktop.

JVM
virtual
XEN: virtualisation for many different types of CPU
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