Write on slides during a presentation
When you use Microsoft Office PowerPoint 2007 to deliver your presentation, you can circle, underline, draw arrows, or make other marks on the slides to emphasize a point or show connections.
To write on slides during your slide show, do the following:
In Slide Show view, right-click the slide that you want to write on, point to Pointer Options, and then click a pen or highlighter option.
Hold down the left mouse button and drag to write or draw on your slides.