A service appliance is installed between production servers running service applications and service users. A determination is made of a number of device addresses supported by a target device and an identifier of the source device. The device for closing an opening further includes a first coupler element disposed on the first flange and a second coupler element disposed on the second flange, the first and second coupler elements cooperating to couple the first flange to the second flange. Next, a PVD metal is deposited onto the previously formed CVD metal layer at a temperature below that of the melting point temperature of the metal. The laser beam can be split into several partial laser beams and guided to the individual laser-beam welding heads. The illumination source is adjustable to selectively illuminate predetermined areas of the vehicle and the surrounding area.