The optional accessway provides a cutout or multiple cutouts (depending on desk model) in the structural upper rear panel of the desk. Shown closed in the left photo, the Rear Accessway Option is completely covered with a finished panel matching the desk and secured with truss head Phillips screws for easy removal.
 
Shown open in the right photo, this option provides easier access to the back connector fields of mixing consoles and the Upper Rack Bays of the High Rise style desks (also applies to low-profile desks and Inspire Sideracks). Especially beneficial for larger, heavier, more tightly wired consoles and rack systems.