A computer system including a processor, a display, and a graphics unit coupled between the processor and the display, in which the processor is configured to perform multi-display operations which generate multiple frames of display data for simultaneous display, and a graphics unit for use in such a system. A variable bit rate communication to be billed has a variable quality of service related to the degree of utilization of a plurality of different networks. 3 gcm3 under load condition of 1. This bearing has at least two bearing surfaces separated differently from the fastening section and arranged on different sides of the connecting element, so that the separated section of the connecting element can tilt in the bearing after the ignition of the pyrotechnic charge.