Mechanisms and techniques are provided which allow a server computer system, such as a web server, to generate information, such as a web page, which includes an audio resource locator configured in accordance with the invention. A rear section is spaced from the front section and extends parallel thereto. The light emitting structure includes a first layer of semiconductor material of a first conductivity type deposited on the substrate, an active layer overlying the first layer, and a second layer of semiconductor material of an opposite conductivity type from the first conductivity type overlying the active layer. Valves are provided to shut off gas flow from the liquidgas separator and to permit gas flow from the compressor tank to a predetermined location such as a recovery line for transferring the gas to the surface or other location. The corridor thus leads out of the room and angles laterally across the wall of the therapy room, before angling again and opening to a safe room. Parasitic PNP transistors in an all-CMOS process are used.