To capture your entire screen, tap thePrtScnbutton. Your screenshot will not be saved, but it will be copied to the clipboard -- you'll need to open an image editing tool (such asMicrosoftPaint), paste the screenshot in the editor and save the file from there.
To capture your entire screenand automatically save the screenshot, tap theWindows Key + PrtScn. Your screen will briefly go dim to indicate that you've just taken a screenshot, and the screenshot will be automatically saved in the Pictures > Screenshots folder.
If you'd like to capture your entire screen for sharing purposes, you can use theWindows Key + H keyboard shortcut. This will capture your entire screen and open the Windows Share toolbar so you can immediately share it with your friends via email, Facebook, Twitter, OneNote, etc.
To take a quick screenshot of the active window, use the keyboard shortcutAlt + PrtScn. This will snap your currently active window and copy the screenshot to the clipboard. You will need to open the shot in an image editor to save it.
Or press Shift-Command-3 to capture the entire screen.