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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]].
"""]]

Mach's [[IPC]] mechanism allows for getting access to a message's sequence
number.

This can be used for serializing requests in a multithreaded environment.

* [GNU Mach Reference Manual: 4.2.6 Message
  Receive](http://www.gnu.org/software/hurd/gnumach-doc/Message-Receive.html)
* [GNU Mach Reference Manual: 4.3.6 Receive
  Rights](http://www.gnu.org/software/hurd/gnumach-doc/Receive-Rights.html)