A method trains a multi-class classifier by iteratively performing the following steps until a termination condition is reached. The storage control unit sends a notification, wherein the notification indicates the change in the configuration of the plurality of logical subsystems. The virtual device driver may also initiate resynchronization procedures or reset the mouse hardware if necessary. When fast fading is detected, a frame length update process is performed. The third lens unit is constructed with at least one negative lens with a concave surface facing the object side. In the event that data cannot be delivered to the second communications unit, an item of information concerning a non-deliverability of the sent data is provided in the transmission status message.