12. A method according to claim 1 , wherein rendering the screen document comprises generating a view of the screen document expressed in terms of primitive figures and parameters.
12. A method according to claim 1 , wherein rendering the screen document comprises generating a view of the screen document expressed in terms of primitive figures and parameters. 14. A method according to claim 12 , wherein the tool code, upon execution, processes the generated view of the screen document to create a display effect by altering the parameters of the primitive figures that make up the view of the screen document.