A feature of a computing device application may be selected by user or other input and then demonstrated using a demonstration application. The zoom lens utilizes a compound zoom structure comprising an NP or NPP zoom kernel followed by a P or PP zoom relay, with only two or three moving groups that can be used for both zooming, focusing and athermalization. In order to simplify maneuvering, more particularly reversing, a trajectory calculator is provided, said trajectory calculator calculating the trajectory of movement for the situation and position of the vehicle on the basis of actual values that are detected by a status and position determining device and on the basis of set values that can be inputted by means of a target input device. At least one additional code book number is provided, which does not refer to a code book but shows information relevant to the section to which it is assigned. The second-switching signal will turn on the second transistor when the first-switching signal switches the first transistor.