19. The system as recited in claim 18 , further comprising an annotation module configured to insert annotations in a selected supplemental content item.
19. The system as recited in claim 18 , further comprising an annotation module configured to insert annotations in a selected supplemental content item. 20. The system as recited in claim 19 wherein the annotation module is further configured to derive an annotated supplemental content item, generate a filename for the annotated supplemental content item and provide the filename to the document editor for presentation in the user interface.