Have you ever wanted to zoom in or out on something in MS Word, Excel, or PowerPoint quickly? One way you can do this is by placing the cursor where you would like to zoom, hold the CTRL key, and dial your mouse wheel forward to zoom in or backward to zoom out.
You can even select objects in the files and use this process to zoom in or out on them.
These instructions can also be found in SharePoint > Software Users Group > Shared Documents > Zooming with a Mouse.