Hi. I really appreciate any help/suggestion about this post. I would like to improve some public presentations and I wonder whether someone knows how to do this. The first question sounds silly but it might be useful in some ocasions. I would like to present some data using powerpoint/Keynote/whatever with a similar "shade" effect like this http://www.apple.com/macosx/features/systempreferences/ The idea is to let the people see the whole screen but keep focus in especific non shaded areas during the talk. The second one is more challenging. Let's say I have two graphics. I want to show them simultaneously somewhere in the same page but since they are dynamic, it would be very very nice to show the curve changes on the fly, during the presentation. It would also be nice to "interact" with these curves with some text being show up as the curves are presented to the public. Thanks again, S.