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[[meta copyright="Copyright © 2007 Free Software Foundation, Inc."]]
[[meta license="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license
is included in the section entitled
[[GNU_Free_Documentation_License|/fdl.txt]]."]]
When two [[principal]]s cannot affect each other, they are said to
be isolated from one another. Strictly speaking, if two principals
are isolated from one another, there is no way for one to know
whether the other exists: all interactions with the environment
do not expose proof of the existence or non-existence of the
other.
Typically, principals are isolated from one another with
respect to a particular property. Common properties include
information-flow (security) and performance.
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