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virtual machine
Last modified: Friday, May 24, 2002 

A self-contained operating environment that behaves as if it is a separate computer. For example, Java applets run in a Java virtual machine (VM) that has no access to the host operating system. This design has two advantages:
  • System Independence: A Java application will run the same in any Java VM, regardless of the hardware and software underlying the system.
  • Security: Because the VM has no contact with the operating system, there is little possibility of a Java program damaging other files or applications.

The second advantage, however, has a downside. Because programs running in a VM are separate from the operating system, they cannot take advantage of special operating system features.

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For internet.com pages about virtual machine . Also check out the following links!

Related Links

The Java Virtual Machine Specification
Description of and link to the online version of the book entitled "The Java Virtual Machine Specification" by Sun's own designers of the Java VM, Tim Lindholm and Frank Yellin.

Yahoo!'s parallel virtual machines page
Yahoo!'s directory of parallel virtual machines.

related categories

Operating Systems

Programming

related terms

J2EE

Java

Jini

JIT

JNI

JVM

operating environment

virtual


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