The compounds of formula Iin which R1, R2, R3, R31, R4, R5, R6 and R7 have the meanings as indicated in the description, are novel effective PDE4 inhibitors. A bounding function is applied to a given cell that places bounds on values or formula results that may be entered into the cell. The request contains identifying information that is associated with the particular user. The second transmitting unit transmits data to the inputoutput driver in response to activation of the control signal.