from e g a memory a table storage or the like the list may be displayed in appropriate form so that the user can visually confirm the status of and feedback about his manipulation an exemplary list of actions having corresponding operational and or processing steps underlaid is shown in fig3 a and 3b which will be described in more detail later on in a second step s 20 a set out of sensors and or detectors available in the device or machine and to be used for the action or task list loaded in step s 10 is selected it is understood that a blood purification device or machine can be equipped with many sensors and detectors of which however not all are always required to be used for a particular action the sensor and or detector selecting step s 20 collects information on sensors and or detectors required to be queried polled and or sampled for a selected action i e sensors and or detectors yielding measurements signals values and the like suitable to allow generation of the desired feedback to the user it is understood that if such sensors are present in the device or machine usually suitable and supportive.