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<div class="chapter">
<div class="titlepage"><div><div><h2 class="title">
<a name="idp17075312"></a>Introduction</h2></div></div></div>
<p>D-Bus is a message bus system, a simple way for applications
to talk to one another.</p>
<p>D-Bus supplies both a system daemon (for events such as "new
hardware device added" or "printer queue changed") and a
per-user-login-session daemon (for general IPC needs among user
applications). Also, the message bus is built on top of a general
one-to-one message passing framework, which can be used by any two
apps to communicate directly (without going through the message
bus daemon). Currently the communicating applications are on one
computer, but TCP/IP option is available and remote support
planned.</p>
<p>The D-Bus API isn't finished yet, and the design is by no
means set in stone. One of our main goals is for lots of projects
to use it, so if you wouldn't use it, by all means mail us and say
why - design, licensing, indentation style, we would rather know
than not know.</p>
<p>D-Bus' only <span class="emphasis"><em>required</em></span> dependency is an
XML parser (either
libxml or expat). D-Bus includes many language bindings to the
D-Bus system, if you want to build those. The list of projects
using D-Bus is growing and they provide a wealth of examples of
using the various APIs to learn from.</p>
<p>Trying out D-Bus in sample applications is encouraged - we
want to get it widely used and tested. It should be working
pretty well these days, and when it isn't bug reports are very
welcome.</p>
<p>For more information on D-Bus, see
<a class="ulink" href="http://www.freedesktop.org/wiki/Software/dbus" target="_top">
http://www.freedesktop.org/wiki/Software/dbus</a>.
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