A process for the control of a gas analyzer, respirator or anesthesia device (10), a control module (19) and a gas analyzer, respirator or anesthesia device (10) are provided with a control module (19). The process is used for the output of online help and for guiding the user via a sequence of operating steps that are executed via defined operational controls (17). Each operational control (17) is designed with a selection signal generator and with an activation signal sensor in order to make possible a visual selection of the respective operational control. The selection may be coupled with the output of a visual indication on the graphical user interface (13).
