| 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} | 
| 340 | DF | .~.~ Window {4} | 
| 343 | DF | .~.~.~ Window differentiation {1} | 
| 344 | DF | .~.~.~.~ Priority {1} | 
| 345 |  | .~.~.~.~.~ Viewing lower priority window |