A system and method is disclosed for operating terminals of a mobile radio communication system operating preferably under an UMTS standard in at least one wireless local area network. The valving is responsive to the representative fuel pressures to control the fuel supply from the second fuel outlet to the second accumulator volume as a function of the fuel pressure in the first accumulator volume. A message is sent to the redundant routing device with an instruction to increase its designation priority to a higher value. The heat exchanger is made economically by heat-forming cavities in relatively thick thermo-plastic sheets, interleaving them with other thermo-plastic sheets having separate gas flow conduit structures, and securing the sheets together. The system can be generalized to handle more than two physiological signals. In response to so determining, one or more frames of image data are acquired via an image sensor connected to the handheld computing device.