Is there a hotkey to magnify the screen?

[Metspitzer]

I am using a logitech 3 button wheel mouse. The mouse I used before
had 4 buttons and the 4th button was for "magnify". Can I use a hot
key?

Yes you can. It is Windows + (+ / -) and it is damn handy for we
blind users.

http://www.addictivetips.com/windows-tips/30-windows-7-hotkeys-ultimate-guide/

 

[SC Tom]

I am using a logitech 3 button wheel mouse. The mouse I used before
had 4 buttons and the 4th button was for "magnify". Can I use a hot
key?

Yes you can. It is Windows + (+ / -) and it is damn handy for we
blind users.

http://www.addictivetips.com/windows-tips/30-windows-7-hotkeys-ultimate-guide/

Here are some more for you:

List of Win7 keyboard shortcuts http://windows.microsoft.com/en-US/windows7/Keyboard-shortcuts