Choosing Your PenWhile playing your presentation/slide show...
Step 1: Right click on your slide.
Step 2: Select Pointer Options
Step 3: Select Pen or Highlighter
Step 4: You can also change the color of your ink from this same menu
To Keep or Discard AnnotationsWhen you exit your presentation, it will ask you if you want to Keep or Discard your ink annotations.
Keyboard ShortcutsThere are also some keyboard shortcuts you can use to access your pens during a presentation.
- ctrl+p during a presentation will turn your pen on
- ctrl+a during a presentation will turn your mouse back in to an arrow
Turn Annotations On or Off
You can also choose to turn your saved annotations on or off. While in the normal view of PowerPoint, click on the Review tab and select "Show Markup" to toggle back and forth between turning the annotations on and off.
Photos from: http://www.dvd-ppt-slideshow.com/blog/how-to-write-annotation-during-presentation-in-powerpoint-2010/