Device for controlling a computer cursor in a system comprising different types of displays

The general field of the invention is that control devices of a data pointer to a data unit comprising two different computer systems, a first secure system comprising at least a first display screen and a man-machine interface called CCD controlling the position of the pointer, a second non-secure system comprising at least a second display screen controlled by the same CCD. The control device according to the invention comprises means called "Manager CCD" belonging to the first system, ensuring the control of CCD transmission links and having the following features activated when a movement command is transmitted by the user CCD, the pointer occupying a first position in the reference plane ,. Determination of the new position of the pointer;. Determining the pointer belonging to area according to this new position ,. Transfer Authorization movement instructions from the CCD to the secure system or to the open system corresponding to the previously determined membership area.