An object of the present invention is to provide a semiconductor resistor that allows improvement in saturation voltage characteristics and a method for manufacturing the same. The one or more markers are retained and selectively rendered as a function of one or more conditions that should be satisfied before the marker is presented to the user. Each pocket slips over one of the jaws of the spring clamp. An optical signal transmitter transmits an outgoing optical signal with the controlled wavelength, while an optical signal receiver receives an incoming optical signal with a single particular wavelength which have been produced through WDM processes. The access control unit is provided with an access control table indicative of a criterion which permits an access from the server.