a workstation with multiple , functionally related displays clustered under and controlled by a common transparent overlay control device . the position of a hand - held stylus is sensed by the overlay control device and is used as a system input to control system operations , system communications and input , manipulation and editing of images displayed on the displays . control of certain workstation operations is achieved by directing the stylus towards function symbols which are affixed to the overlay surface . actuators or other adjustment mechanisms are provided for adjustment of the height and pitch of the workstation for the comfort of the operator . further , the workstation provides integrated data audio communication over ordinary narrow - band telephone lines or high speed data lines with other linked workstations .