Calibration-required data displayed by an industrial visual display system, which can be configured using a predetermined configuring software and which has a standard interface for integrating additional applications. To this end, the calibration-required data are integrally protected and optionally encoded. The calibration-required data are then transmitted to the visual display system and decoded therein by an application that is integrated via the standard interface, after which they are visually displayed in a form that is different from the presentation possibilities that can be configured by the configuring software.