A technique for deskewing digitizer channels in an automatic test system includes applying a waveform of known frequency to the input of each digitizer channel. According to the invention the mobile station comprises first input means and first display means, which are used in the first functional mode, and second input means and second display means that are used in a second functional mode. The first end and the second end comprise a first extension and a second extension respectively. A control device is connected with the sets of illumination devices for separately controlling each of the sets of illumination devices. Also disclosed are methods of creping paper with the composition.