So there comes a time when you're presenting (or you know, you're old) and you want to zoom in on an area of the screen.
Press the Windows + Plus (+) on the keyboard to turn the built-in Magnifier on. Then, you can press Windows + Esc to turn it off.Now we use a Fujitsu pen-based TabletPC when means we can write on the screen with a pen or tap the screen in the place of a mouse. Here's a video run-down of how that works on a touch screen -- this definitely the preferred & quickest way to get around!
When you're on a touch/pen device, to zoom in and out you can tap on the plus (+) and minus (-) symbols on the corners of the screen. To move around the screen, drag along the borders of the screen in full screen view.
To instantly zoom out and see where you are on the screen, tap with one finger on opposite borders of the screen simultaneously.
Now, if you're not using a pen/touch enabled device (and you should be!) you can still use the magnifier. Go ahead with the Windows + Plus (+) keypress and you'll get the magnifier. There are three modes -- I prefer the LENS option, which gives you a rectangular magnifying glass you can rove around the screen with.
Use your mouse to rove around the screen with the Lens -- if you put your mouse over top of the Magnifier menu, you can interact with its options.
And, you can always press Windows + Esc to turn the magnifier off.