1. A method of editing objects displayed on a screen of a display assembly of a pen based computer system, the method comprising the steps of: selecting a portion of an object to be edited, the selected portion of the object being displayed at an original location on the screen; highlighting the selected portion of the object; drawing a bounding box about the highlighted portion of the object; and editing the object wherein during the editing step a user is permitted to duplicate the selected portion of the object by tapping a stylus on the screen at a location that is within the bounding box, wherein no other actions by the user are required to facilitate the duplication; wherein when a duplication of the selection portion of the object is made, a duplicate of the selected portion of the object is displayed at a position that is offset from the position of the original selected portion of the object in a display updating step.