345 / | HD | COMPUTER GRAPHICS PROCESSING, OPERATOR INTERFACE PROCESSING, AND SELECTIVE VISUAL DISPLAY SYSTEMS |
326 | DF | OPERATOR INTERFACE {6} |
339 | DF | .~ On-screen workspace or object {6} |
356 | .~.~ Hierarchy or network structure {1} | |
357 | DF | .~.~.~> Navigation within structure |