I will be running a scoreboard for an event off of Keynote 08 to an LCD projector. I'd like to be able to update the scoreboard (which is essentially a slide with a chart on it) without the audience seeing it being updated. When I am then satisfied with the changes, I'd like the slide being shown to the audience to update. Also, if it is possible I could also just show a slide with just some text saying it is being updated.. Is there anyway to do either of these two? If not, I suppose I can just use the picture mute function on the projector but I think these two instances I mentioned above would make the presentation run smoother. Any help is much appreciated!