A clutch unit comprises a wet friction clutch for controllable transmission of a torque from an input element to an output element, oil for cooling the friction clutch, and an actuator for actuating the friction clutch. The apparatus would comprise a sturdy plastic case which would have a base and a lid. The first and second write pulse signals are used for a single reset operation of the memory cell. Then, the batch process is interrupted based on an associated step type of a current step, the interrupting comprising comparing the associated step type to a user parameter.