The present invention provides a control method for switching display between a plurality of OSs as well as a computer system. A selection of a plurality of priorities available for transmitting a wireless communication transaction on a wireless network is provided, wherein the priority to be selected corresponds to the speed and allowable delay by which the transaction is to be transmitted. The baffle vents can function as radiant barriers by providing the baffle vents with a reflecting coating or reflective surface. The substrate trays are cooled in a second load-lock chamber, thus producing substrates each formed the alignment layer thereon.