registered names. Internally they use the basic interface
@samp{org.freedesktop.DBus}, which is supported by all objects of a bus.
-@defun dbus-list-activatable-names
-This function returns the D-Bus service names, which can be activated.
-An activatable service is described in a service registration file.
-Under GNU/Linux, such files are located at
-@file{/usr/share/dbus-1/services/}.
+@defun dbus-list-activatable-names &optional bus
+This function returns the D-Bus service names, which can be activated
+for @var{bus}. It must be either the symbol @code{:system} (the
+default) or the symbol @code{:session}. An activatable service is
+described in a service registration file. Under GNU/Linux, such files
+are located at @file{/usr/share/dbus-1/system-services/} (for the
+@code{:system} bus) or @file{/usr/share/dbus-1/services/}. An
+activatable service is not necessarily registered at @var{bus} at already.
The result is a list of strings, which is @code{nil} when there are no
-activatable service names at all.
+activatable service names at all. Example:
+
+@lisp
+;; Check, whether the document viewer can be accessed via D-Bus.
+(member "org.gnome.evince.Daemon"
+ (dbus-list-activatable-names :session))
+@end lisp
+
@end defun
@defun dbus-list-names bus
@end defun
@defun dbus-list-known-names bus
-Retrieves all services which correspond to a known name in @var{bus}.
+Retrieves all registered services which correspond to a known name in @var{bus}.
A service has a known name if it doesn't start with @samp{:}. The
result is a list of strings, which is @code{nil} when there are no
known names at all.