Qt D-Bus allows applications to send messages to each other using D-Bus. This page lists examples which specifically use D-Bus for inter-process communication (IPC).
Demonstrates communication among instances of an application.
Demonstrates usage of the Qt D-Bus typesystem.
Shows how to access the D-Bus bus daemon service.
Demonstrates a simple message system using D-Bus.
Shows how to use Qt D-Bus to control a car from another application.