There is this feature in Windows 7 called magnifier.
This tool is used to preview screen layouts in a close range or in the normal size.
However maybe you feel a pro using the keyboard instead of a mouse and so; I having understood your thirst, this blog brings you a direction to follow in your quest for technological power.
Follow the below guides:
Windows logo key + Plus Sign or Minus Sign – Zoom in or out
Ctrl+Alt+Spacebar – Preview the desktop in full-screen mode
Ctrl+Alt+F – Switch to full-screen mode
Ctrl+Alt+L – Switch to lens mode
Ctrl+Alt+D – Switch to docked mode
Ctrl+Alt+arrow keys – Pan in the direction of the arrow keys
Ctrl+Alt+R – Resize the lens
Windows logo key + Esc – Exit Magnifier
Interesting enough, a magnifier managed by use of a keyboard is quicker in handling than using the mouse or a touchpad.
However it depends with the user preference.