How-To capture only a specific portion of the screen in Windows 7?
Windows 7 provides you with a tool called the Snipping Tool, with the help of which you could actually select a portion of the screen whose screenshot is to be taken. This is very helpful since you are now freed of the hassle of 'Prnt Scrn'-ing the entire screen and cropping the required portion out. You can start the Snipping Tool from the start menu.
This screencast below will make it clear:
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