Unity, C++, opening a Unity folder out of a QT-application

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http://askubuntu.com – I wrote an QT-application, which shows a "QTreeWidget" of a certain directory and its sub-directories. Now I would like to make unity open a folder e.g. /home/Username/, by clicking one of the applications "QTreeWidgetItems". Unfortunately i don't know how the communication between Unity and the Qt-app works. Can somebody tell me how that could be done ? Thank you, DocCruiser (HowTos)