Methods, systems, and apparatus, including computer program products, for implementing a software architecture design for a software application implementing tax declaration. A multitude of interchangeable pairs of casting rollers having different casting roller diameters D depending on the strip width B to be cast, are associated with the thin-strip casting device. Each financial transaction includes associated information. The control block processes only other terminals located inside external area 7 as in-service area and displays the users of these other terminals onto display screen 2x.