Break up `Mach' and `Mig' hierarchies, merge them into `microkernel/mach/', `microkernel/mach/gnumach/', `microkernel/mach/mig/', and elsewhere.

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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.
+"""]]
+
+# Concepts
+
+A [[microkernel]] implements a minimal number of abstractions
+that facilitate the realization of operating system services.
+
+[[Mach's_concepts|mach/concepts]] are documented here.
+
+Read OSF's Kernel Principles.  Find it under the
+[[mach/documentation]] link.
+
+# Exercises
+
+Mach's API is documented in OSF's Kernel API book.  Find it
+under the [[mach/documentation]] link.  Skim it to get an idea
+of how the API looks and then try the following exercises:
+
+Send messages using Mach's IPC mechanism
+([detailed description](http://walfield.org/pub/people/neal/papers/hurd-misc/mach-ipc-without-mig.txt)).
+
+Implement your own pager.  Write a server that synthesizes
+content on the fly and have a client map the object into its
+address space and print out the file.