As part of a communication session, a wireless source device can transmit audio and video data to a wireless sink device, and the wireless sink device can transmit user input data received at the wireless sink device back to the wireless source device. A reduction of the equipment cost or a flexible adaptation of the operation can be achieved by a supplementary firing being associated with the heat recovery steam generator, which by combusting a carbonaceous fuel produces additional exhaust gases with CO2 content and transmits them through the heat recovery steam generator. The stopper may prevent the semiconductor device received in the recessed bottom from escaping from the pocket.