The Magnifier is one of Windows 7’s great accessibility features. Most of us never need them: the Magnifier, the Narrator, the On-Screen Keyboard and High Contrast. But they are useful for those with impairments and for others in special situations. For example, if you have a problem with your keyboard you may find the on-screen one helps you out of a jam.
The Magnifier may be accessed via the Control Panel’s Ease of Access section. You can also start it using the keyboard by pressing the Windows Key + + (Win key 
and the plus key 
simultaneously.) It can be turned off using the Windows Key + Esc.
The Magnifier has three modes: full screen, lens and docked. You can change the magnification level and invert colors via the Options button 
.
Learn more about it at http://windows.microsoft.com/en-us/windows7/Make-items-on-the-screen-appear-bigger-Magnifier.
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