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-[[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. A sub-Hurd is like a neighbor Hurd,
-however, makes use of some resources provided by another
-Hurd. For instance, backing store and the console.
-([[SubhurdHowto]])
-
-Sub-hurds are extremely useful for debugging core
-servers as it is possible to attach to them with gdb
-from the parent ([[DebuggingViaSubhurds]]. This avoids
-deadlock, e.g., when the instance of gdb stops the
-server but requires its use.
-(Note: it is possible to use [[NonInvasiveDebugging]],
-but this is less flexible.)