Bleed widths are set for finishing pages. A transparent display is formed at a central part of the opaque display and a camera is formed at a rear side thereof, thereby allowing a realistic call in eye contact with the other party and at the same time, the readability to be improved even in cases of a usual display use. For each Central Processing Unit register, the invention uses one or more auxiliary latches wherein one latch is used as the \u201crunning\u201d latch and one of the auxiliary latches is attached to task storage memory. The positioning signal comprises information about the orientation and spacing of the X-ray source relative to the X-ray receiver. Several withdrawal positions are preferably connected in a common shunt system, with valves, controlled by the differential pressure, that are located between adjacent positions.