The general field of the invention is that of aircraft cockpit viewing systems including a piece of human-machine interfacing equipment, a piece of data processing equipment and a viewing device. The piece of data processing equipment comprises a database including a plurality of objects and means for computing various displaying windows, each object having a plurality of forms of graphical representation in said windows. The viewing device is arranged to display the displaying windows. The piece of human-machine interfacing equipment includes means for selecting a state of graphical representation of an object in one of the windows. The states of graphical representation of the objects include a “selected” state. When the selection of a state of graphical representation of an object is effective, the computing means of the piece of processing equipment switch all of the various graphical representations of said object in the various windows to this “selected” state.