We will be, sooner or later, not only handling personal computers but also mul- purpose cellular phones, complex personal digital assistants, devices that will be context-aware, and even wearable computers stitched to our clothes we would like these personal systems to become transparent to the tasks they will be performing. In fact the best interface is an invisible one, one giving the user natural and fast access to the application he (or she) intends to be executed. The working group that organized this conference (the last of a long row ) tried to combine a powerful scientific program...