A handheld device (10) has a graphic display (12), an interface (18) for wireless data transmission, an input unit (14) for input of control commands, and a control unit (16) connected to the display (12), the interface (18), and the input unit (14). The control unit (16) is designed to display a schematic diagram of a human body on the graphic display (12) and to allow a selection of partial regions of the diagram with the help of the input unit (14).
