a system for controlling an apparatus , which system comprises a control unit adapted to transfer control signals to the apparatus dependent on the control data . said control unit comprises data input means to input said control data , and said apparatus comprises interpreting means adapted to translate said control signal into an action . aiming to indicate for a user of the control unit , which action the apparatus is arranged to take when activating the data input means , a visual indicator is arranged on said data input means . the invention is characterized in that said data input means comprises a variable presentation means , arranged to realise said indicator , wherein said control unit comprises a first storage means adapted to store the visual data presentable with said presentation unit . preferably , said control unit comprises several separate data input means , each provided with a presentation means , in which each presentation means comprises separate displays , arranged to present a picture dependent on said visual data .