Analysis of information sources in references of the Wikipedia article "D-Bus" in English language version.
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we are working on moving things to a true user bus, of which there is only one per user on a system, regardless how many times that user happens to log in
Since systemd's inception it has been the IPC system it exposes its interfaces on.
One of the most important developments to come out of the Linux desktop is the Desktop Bus (D-Bus), a message-passing system. D-Bus is important because it serves as an interprocess communication mechanism that allows desktop applications to talk to each other [...].
For the within-desktop-session use case, the GNOME and KDE desktops have significant previous experience with different IPC solutions such as CORBA and DCOP. D-Bus is built on that experience and carefully tailored to meet the needs of these desktop projects in particular.
D-Bus [...] is designed for use as a unified middleware layer underneath the main free desktop environments.
D-Bus was first built to replace the CORBA-like component model underlying the GNOME desktop environment. Similar to DCOP (which is used by KDE), D-Bus is set to become a standard component of the major free desktop environments for GNU/Linux and other platforms.
There are also some reimplementations of the D-Bus protocol for languages such as C#, Java, and Ruby. These do not use the libdbus reference implementation
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)
The low-level implementation is not primarily designed for application authors to use. Rather, it is a basis for binding authors and a reference for reimplementations. If you are able to do so it is recommended that you use one of the higher level bindings or implementations.
dbus-glib uses the libdbus reference implementation, GDBus doesn't. Instead, it relies on GIO streams as transport layer, and has its own implementation for the D-Bus connection setup and authentication.
