At my Photoshop seminars, I often zoom in on a portion of my screen so that people at the back of the room can read some of the fine detail in an image, palette, or icon. If you use a Mac and would like to temporarily zoom in on your screen, then do the following:

1) Choose System Preferences and then click on the Universal Access icon.

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2) Click the large button labeled Turn On Zoom (that is unless it happens to be labeled Turn Off Zoom).

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3) When you want to zoom in on a portion of your screen, position your mouse over the area and then hold both the Option and Command keys and then press + to zoom in. The more times you press that key combo, the more you’ll magnify your screen. When you’re all done hold the same two keys down and press – to zoom out.

I’m sure there is a utility available for Windows that has similar functionality, but as far as I know it’s not built into the operating system… if I’m wrong, please let me know where to find the feature.