A method of and apparatus for controlling data transfer between two stations comprises a link manager for controlling allocation of available channels in a plurality of communications links. The tray facilitates a safe transfer of instruments between a procedural team and performing the procedure. The annular nozzle includes an annular adapter and a suction tube having an internal section and an external section with an outer diameter less than the outer diameter of the first tubular. The tab member outer edge is passed through the slot of the slot member to engage the fastening device. Light used to produce the image is scanned in two orthogonal directions either before or after the light is focus modulated. Furthermore, the interface allows manipulation of these frames including, but not limited to, playing of the entire segment represented by that key or significant frame as well as actual determining of the cuts between significant segments.