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A modern electrical installation, equipped with an integrated home system, must be transparent and user friendly for the end user. He/she does not need to know how and through what cables the system data communications are done. What is important for him/her is the function allocated to the pushbuttons and other components. He/she needs to know what happens when a certain pushbutton is pressed. Perhaps just one light goes on or off. However, with another pushbutton a number of lights may come on in a dimmed state, the roll-down shutters may be lowered, and the temperature can be set to comfort mode. In any case, the function of each pushbutton, motion detector, card reader, etc, must be clear right from the start.