[[license text="""
Copyright © 2007 Free Software Foundation, Inc.

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]].

By contributing to this page, you agree to assign copyright for your
contribution to the Free Software Foundation.  The Free Software Foundation
promises to always use either a verbatim copying license or a free
documentation license when publishing your contribution.  We grant you back all
your rights under copyright, including the rights to copy, modify, and
redistribute your contributions.
"""]]

It is possible to run multiple instances of the Hurd
in parallel, on a single instance of Mach.  Other than
performance [[crosstalk]], they are essentially isolated.
Practically, as many devices do not allow multiple
non-[[cooperating]] users, e.g., hard drive and network
this is not currently possible.  It can be overcome,
however, by [[virtualizing]] these problematic devices.

When extra hardware is not available, it is possible to use a
[[sub-Hurd|subhurd]].