The present invention is directed to raising a detectable immune response in a vertebrate by administering in vivo, into a tissue of the vertebrate, at least one polynucleotide comprising one or more regions of nucleic acid encoding a SARS-CoV protein or a fragment, a variant, or a derivative thereof. Because the Y device is essentially passive, communications paths between the PSE devices and the PD are provided for negotiating masterslave status and other status and related information among the respective network devices. Also, a resource UID is presented that will not change despite changes to the URL or the resource tag of the resource. An electromechanical arresting mechanism is arranged to be energized for releasably arresting the return spring in a compressed state in result of the detected end-of-stroke position. An edge detection unit generates start signals for edge triggered interrupt messages on the basis of the request occurrence signals. The blade may be fixed in this position, or it may be switchable between the nonparallel orientation of the present invention and the parallel orientation typical of traditional ice skates.