virtual machine monitor (VMM)
A virtual machine monitor (VMM) is a host program that allows a single computer to support
multiple, identical execution environments. All the users see their systems as self-contained
computers isolated from other users, even though every user is served by the same machine. In this
context, a virtual
machine is an operating
system (OS) that is managed by an underlying control program. For example, IBM's VM/ESA can
control multiple virtual machines on an IBM S/390 system.
In Microsoft Virtual Server 2005, Virtual Machine Monitor is the proprietary name for a
kernel-mode driver that functions as a firewall
between the host OS and the virtual machines. It can prevent any single program, running in one of
the virtual machines, from overusing the resources of the host OS.
This was last updated in October 2006
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