An operating and display device is provided for a vehicle having a display unit and having a rotary knob for selecting a function andor for selecting a menu within a hierarchical menu structure shown using the display unit. The blocking layer inhibits the propagation of anti-phase domain defects into the active layer. The quality measure can consider requirements such as those minimizing a distance between the color signal and the multiprimary signal, an energy change as well as a phase change between the multiprimary signal and its neighbors, all leading to improved image quality. The alerting occurs if the other user is registered as a buddy of the user and if a geographical distance between the user’s device and the buddy’s device is smaller than a pre-determined threshold. Once defined, network traffic to and from an application is monitored to detect business signatures, to detect that a corresponding business activity was started.