THE CLK's range of electronic aids such as traction and stability control are controlled by an electronic network that interlinks the CLK's various microprocessor units. These exchange their information via two digital 'data highways' in the engine compartment and passenger compartment. Communication is on the so-called "bus" principle - cable-based transfer technology in which the data is received by all the control units in the circuit. The bus receivers themselves are capable of deciding whether individual items of information are important or unimportant for their functions. Mercedes-Benz uses the so-called CAN system (Controller Area Network) for its databus. Mercedes-Benz is the world's first automobile manufacturer to have interlinked the local sub-networks and created a global network which permits a rapid exchange of digital information between the engine and the interior.