The invention relates to an active sensing device configured to capture and decode infrared position tags from a page. The opposed joining edges are abutted against each other with the joining sections of the left and right undercover members overlapped in face-to-face relation with each other in a front-and-rear direction of the outboard engine unit. 0 part by weight of phosphoric acid ester type nucleating agent and 1. Restraining means are also described for restricting movement of the members with relation to each other. The method additionally includes generating an end-point signal upon detecting the detectable change. The present invention is broadly directed to systems and methods for providing efficient startup procedures in computer systems.