In order to call mobile stations, mobile stations are, according to the invention, allocated to time slots for calling on the basis of subscriber-specific profiles. The slight-on level is higher than the off-level and is lower than a full-on level. If the semiconductor structure is a capacitor, the protrusions help to increase the capacitance of the capacitor. Different sized nanocrystals are used to produce the different colors. The method allows the customer to input financial data into a computer and receive resulting reports from the same computer without having to do any data manipulation, programming, or calculations.