Under the present invention, when a requestor submits a request for an item, a single, appropriate back-end system for processing the request is identified. A method for the operation of such a processing machine arrangement is also provided. The second modulator includes an input for receiving a second input signal, and an output for providing a second modulated output signal corresponding to the second input signal. The first and second flips may extend at angle from the boards so as to obtain a polygonal box.