Speaker notes are notes added to PowerPoint presentation slides as a reference for the presenter. This is an area of a PowerPoint slide that is hidden during the presentation, and this is reserved for notes for the speaker.
On the Slide Show tab (in the Monitors group), click Use Presenter View. In the Display Settings dialog box (on the Monitor tab), click the monitor icon that you want to use to view your speaker notes, and then select the This is my main monitor check box.