Instead of launching applications in a virtual desktop environment, it is often more convenient if you can immediately start an application. The X2Go program explained on the previous page supports this. Just follow the same steps for setting up a connection as described there, but now select 'Published applications' under 'Session type' when you set up your session.
Now click on the circle icon after launching this session as shown here:
This show a window where you can select an application, clicking start will launch QGis directly, as if it were running on your machine. However, you do have access to the PROBA-V archive!