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<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE topic PUBLIC "-//OASIS//DTD DITA Topic//EN" "topic.dtd">
<topic xml:lang="en-us" id="security-model">
<title>The Security Model</title>
<body>
<p>
One property of virtual machine monitors (VMMs) like
<ph conkeyref="vbox-conkeyref-phrases/product-name"/> is to encapsulate a guest by executing it in a
protected environment, a virtual machine, running as a user
process on the host operating system. The guest cannot
communicate directly with the hardware or other computers but
only through the VMM. The VMM provides emulated physical
resources and devices to the guest which are accessed by the
guest operating system to perform the required tasks. The VM
settings control the resources provided to the guest, for
example the amount of guest memory or the number of guest
processors and the enabled features for that guest. For example
remote control, certain screen settings and others. See
<xref href="generalsettings.dita">General Settings</xref>.
</p>
</body>
</topic>
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