Methods and apparatus, including computer program products, for activating assertions and breakpoints. The control member 116 is arranged to face, via the developing sleeve 119, one of a plurality of magnetic poles provided inside the developing sleeve 119. Connecting terminals for mechanical andor electrical components are provided on the exterior of the casing parts. The registered user will either be directed to a biller website or a Customer Service Provider andor a Business Service Provider website and given the option to pay the bill electronically. On the other hand, at the time of a light load, the series regulator is operated.