Windows Screen Capture (Prtscn)
The easiest way to take a screenshot using your PC is to use the Printscreen Button (Ptr Scn / Screen Capture) that is located at the top right hand corner of your keyboard. If you click it once it would appear as if nothing happened. But your operating system just copied an image of the entire screen to the clipboard.
The absolute easiest way to take a screenshot in Windows using your PC is to use the PrtScn (PrintScreen) function button. You’ll find it on the upper right side of even these best gaming keyboards under 50. Click it just once and…It’ll seem like nothing happened. But Windows just copied the image of your screen to the clipboard. You can then hit Ctrl-V to paste it into a program, whether it is a Word document or an image-editing program.
The problem with PrtScn is, it’s not discerning—it gets everything visible on your monitor or monitors (if you’ve got a multi-monitor setup, it’ll grab all the displays as if they’re one big screen).
To narrow things down, open a window, make it the focus of attention, and then tap Alt-PrtScn. That also appears to do nothing, but it’s in fact taken a screen grab with the use of a monitor screen protector of just that window and copied it to the clipboard.