For many applications, it is desirable to use fans which weigh less than 30 grams and are driven by electric motors not more than a few centimeters in size. A client probe detects execution of the client service on a first client device, and sends an instant message with address information to a second client device. It is noted that the gas is blown out during a period of time at least when the pressure foot and the stiffening plate are moving relatively in the horizontal direction. The invention also discloses a circuit arrangement in which a corresponding phase staggered control is achieved with only one counter.