A network adapter detection is used to establish a videoconference between a videoconferencing unit and a remote endpoint. The leadframe’s leads include a lead lock provided at a free end of each inner lead that is adapted to increase a bonding force of the inner lead to a resin encapsulate, thereby effectively preventing a separation of the inner lead from occurring in a singulation process involved in the fabrication of the semiconductor package. An independent-steering apparatus serves for all of the wheels. The reflected light is returned so as to be condensed and focused on a light receiving surface of sensor in a light measuring device. In optical reproduction from an optical disc on which information is recorded, the optimum power of irradiation for reproduction can be set, and degradation of the information due to the reproducing light can be prevented. The software architecture includes a plurality of layers arranged in order from layers providing higher level services to layers providing lower level services, at least one software module in each layer, and interface means for permitting communication among software modules pursuant to a set of defined dependency rules.