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[[!meta copyright="Copyright © 2007, 2008, 2010 Free Software Foundation,
Inc."]]
[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="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]]."]]"""]]
Read about the [[general concept of *inter-process communication* (IPC)|/ipc]].
On Mach, an IPC is done by invoking a [[port]].
The two fundamental operations, to *send* and *receive* [[message]]s, are used
to implement a [[RPC]] system.
[[Sequence_numbering]].
[The Unofficial GNU Mach IPC beginner's guide](http://www.nongnu.org/hurdextras/ipc_guide/ipc_guide.html)
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