An action button works just like a hyperlink. The cool thing about Action Buttons is they are typically in recognizable shapes like arrows.
In this way, you can create one arrow that moves a user to the previous slide and another arrow that moves a user to the next slide.
Figure 26. Available Action Buttons
Action buttons make a presentation extraordinarily easy for even a PowerPoint novice to navigate. They work particularly well on training presentations or on presentations left unattended at kiosks.
Inserting an Action Button
Choose Slide Show: Action Buttons from the Menu bar
Under the Action Buttons sub-menu, choose a shape
Draw the shape on your slide (click and drag)
Figure 27. Reference Settings Dialog Box
4. Choose Hyperlink to
5. Select a Slide
6. Click OK