A network arrangement uses a poll select control protocol and a loop back arrangement at each node for equalizing transmission delay from each node to a central station. The workpiece identification marking has a plurality of identification elements, each of which comprises elevations that project out of the surface of the workpiece. The actuating member is rotatably assembled to the sidewalls and includes a pair of actuating arms each formed with an actuating end at one distal end thereof, and an operating portion across the sidewalls along a lateral direction perpendicular to the longitudinal direction and connecting the other distal ends of the pair of actuating arms. A pulse power source comprising a charging capacitor and a magnetic compression circuit comprising a pulse transformer, provides electrical pulses having sufficient energy and electrical potential sufficient to produce the EUV light at an intermediate focus at rates in excess of 5 Watts. The second demodulation technique can differ from the first demodulation technique. In the player, a deck body, having a cassette playing unit, is provided with an openable door.