21. A method according to claim 1 wherein: i. the graphical tool is included in the screen document in response to the activation of a tool button by a user, and ii. activation of the tool button by the user results in processing of the tool document file to include the graphical tool within the screen document.
21. A method according to claim 1 wherein: i. the graphical tool is included in the screen document in response to the activation of a tool button by a user, and ii. activation of the tool button by the user results in processing of the tool document file to include the graphical tool within the screen document. 22. A method according to claim 21 , wherein: i. the tool code associated with the tool document file, upon execution, processes at least one of the content documents or the tool document file to create a derived document which forms part of the screen document, ii. the derived document presents at least a portion of the at least one content document in a manner that achieves a display effect associated with the tool, and iii. the display effect is portrayed in the rendered screen document when the user activates the tool button.