I can't Trolltech's D-BUS Definition.

[Lim,GeunSik]

Hello, I am using dbus-0.61-3 at fedora core 5 now. Recently, I wondered about dbus's definition.
Because Trolltech said that D-BUS is an Inter-Process Communication(IPC) and RPC using below website. 
Is it correct Really? I can not understand Definition that Trotech wrote.
Please, Can anyone explaind about definition of D-bus exactly?
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* http://www.freedesktop.org/wiki/Software/dbus
What is D-Bus?
D-Bus is a message bus system, a simple way for applications to talk to one another. 
In addition to interprocess communication, D-Bus helps coordinate process lifecycle; 
it makes it simple and reliable to code a "single instance" application or daemon, 
and to launch applications and daemons on demand when their services are needed.
* http://doc.trolltech.com/4.2/intro-to-dbus.html
Introduction 
D-BUS is an Inter-Process Communication (IPC) and Remote Procedure Calling (RPC) mechanism 
originally developed for Linux to replace existing and competing IPC solutions with one 
unified protocol. It has also been designed to allow communication between system-level 
processes (such as printer and hardware driver services) and normal user processes. 
 
 
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