Hi there,
When I draft some slides via Powerpoint, usually I prepare some more information for couple of slides in advance in case I find I need to bring more introduction to audiences besides the content on the slides. Of course, the extra prepared informaiton or data might not be used during the presentation, just in case.
Therefore I'm looking forward to a back page that I can create for each slide, then I can define what to put on the front page, what to put on the back page, on which I can put more materials, when I'm going through this slide, I can easily show the back page by clicking on a funct key or a special button of the remote controller, according to the instant reaction of the audiences during presentation.