Qt 4 D-Bus module Qt is a cross-platform C++ application framework. Qt's primary feature is its rich set of widgets that provide standard GUI functionality. The QtDBus module is a Unix-only library that you can use to make Inter-Process Communication using the D-Bus protocol. Applications using the QtDBus module can provide services to other, remote applications by exporting objects, as well as use services exported by those applications by placing calls and accessing properties.