The Virtual Terminal concept as defined in the international ISO 11783 standard is the perfect man-machine interface for any situation in which a series of different subsystems in or on a vehicle needs to be controlled. It offers a high degree of flexibility and sustainability in terms of the development and productive operation of mobile machinery. vt-designer is a convenient and highly efficient tool with which to implement user interfaces for virtual terminals. The distributed architecture of the control system means that when you come to develop a machine control system, you can modify, exchange or add individual applications at any time without having to redesign the entire system. It is, therefore, a simple matter to realize universal concepts not only for individual types of machinery, but for whole model series and machine families.