Many of us just don't know the use of this button. Many people use to search Screen Captor software over the internet and they even don't know that they can capture their screen using this button. Now let me show you how to capture your screen using this button.
1. Open that page or document of which you want to take screenshot.
2. Now press that PrntScr button.
3. Now open Paint, and press CTRL+V there.
4. Now your shot will appear in the Paint, and you can easily edit that screenshot.
There is another alternative way to capture screenshot. This tool is built-in and available in every version of windows. All you need to do is just search it or if you are using windows 7 or windows Xp you can find this tool in the Accessories tab.