A pointer is guided by a user of a processing machine in succession to a number of locations of a working space of the processing machine. The pointer has first location determining devices which are arranged at predetermined pointer locations relative to a pointer coordinate system in fixed relationship to the pointer. Through interaction of the first location determining devices with second location determining devices arranged at predetermined locations relative to a machine coordinate system in fixed relationship to the processing machine, data describing a geometric relationship of the location determining devices relative to one another are acquired. These data are transmitted to a control device which determines the position of the pointer in the working space based on the characteristic data and based on the data subdivides the working space into a permitted movement range for a component of the processing machine and a complementary prohibited movement range.