Usually in PowerPoint what the audience sees, is what the speaker sees also. There is a way however for the speaker to view his notes, while the audience is looking a the pretty picture on the screen.
Here’s how to do it.
Click on the Slide Show Tab and click on the Presenter View box.
Now when you are giving your presentation, you can see your notes.
This unfortunately doesn’t work when you don’t have the projector hooked up so the only way to practice is to hook up a projector and practice ahead of time.