An optical transmission system is provided in which the optimum operating point of a Mach-Zehnder interferometer, matched to the optical frequency of the light source on the transmitting side, can be set. The helix formation defines a helical guide path within which a loop formation, that is formed at one end of a flexible line which has a ball connected at its other end and that can be located around the pole, is displaceable. Instead, during a synchronization, the filter is applied to incoming changes received from the data subset and to outgoing changes that are intended to be sent to the data subset. Each fetch resides on a mirrored document of a non-Domino web server in a form that does not require a unique html document for each fetch. In addition, methods and apparatus in accordance with this invention are provided for modifying or inserting additional print files into a print job that has already been processed through a workflow, and processing only the modified or inserted print files through the workflow. Thus, when the push button of the locking device is pushed downward, the support rack is unlocked from the locking device and is pivotable relative to the main frame to fold the pedal stand, so that the pedal stand is folded easily and quickly.