Window 7:
window 8:
To take a screenshot and save it as a file. Press the Windows logo key + PrtScn. Or, if you're using a tablet, press the Windows logo button + the volume down button. The screen will dim for a moment when the screen is copied and saved as a file in the Screenshots folder (which is in your Pictures folder).
Window 10:
To Take a Screenshot of Only One Window. Click on the title bar off the window that you want to take a screenshot of to make it the active window on your screen. Press the “Alt + PrtScn” key. A screenshot of your currently active window is copied to the clipboard, paste it wherever you like.
Mobile :
Press the Power button and Volume down key at the same time.
Remember to hold them until you hear a click or a screenshot sound
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