If you’re a trainer or you need to demo a technique in front of a group of people, there is nothing worse than losing your audience because they can’t see your cursor or the detail you’re pointing at. Fortunately, Mac OS X has a built-in solution for this problem: screen zoom.
To enable screen zooming, open System Preferences, click on Universal Access, and click On in the Zoom area. You are immediately ready to zoom: Press Command-Option-= to zoom in and Command-Option-hyphen to zoom out. If you click the Options button in Universal Access, you can fine-tune how Mac OS X displays the zooming effect – for example, you can set how far the screen should zoom in.
Zooming in and out is a great way to draw your audience’s attention to just what you want them to see.