delaying driving of the window pane this means that during the response time of the relay 12 and hence before any driving of the pane 2 by the electric motor 3 begins the vibration generator 9 sets the pane 2 in high frequency vibration while still at rest causing any bridges between the pane 2 and the door 1 due for example to icing or dirt to be broken at the beginning of the sliding motion of the pane 2 relative to the door 1 therefore the electric motor 3 is not required to exert excessive forces to destroy such bridges moreover during the ensuing sliding of the pane 2 in the guides 4 and 5 the driving forces to be applied by the electric motor 3 to the pane 2 are low because the pane 2 continues to vibrate as before reducing the friction between the pane and its guides 4 and 5 the window arrangement according to the invention as described above is especially advantageous in that the electric motor 3 or any drive for the sliding movement of the pane 2 may be made smaller and requires less power than in conventional window drive arrangements this in turn means that there is less drain on the battery during operation of the window an entirely different advantage is that the reduction.