A method for ascertaining a rotational speed parameter for determining a setpoint torque for driving a drivetrain. One or more heater structures and one or more temperature sensor structures situated on a substrate may be used in conjunction for measuring a thermal conductivity of a gas in the enclosure. Said dosing units comprise, respectively, a dosing piston which is mounted in a piston chamber, whereby the dosing piston moves at least in a rotational manner about the piston axis thereof. The personalizing engine also configures a user interface on a second mobile device to provide a user interface link based on the profile to enable a user to access the user interface link via the second mobile device. The portable communications device means for receiving wireless transmissions from the terminal are further configured to receive additional data transmitted wirelessly from other sources, such as message delivery beacons distributed in the locality. This makes it possible to prevent the target amount of code from becoming very large or very small.