Keyboard "Prt Scr Sys Rq" key function

We in the computer's keyboard often see "Prt Scr Sys Rq" key, but few people know that this key function, then the "Prt Scr Sys Rq" key what use is it?

This key is called screenshot capture screen button or key. When you press the keyboard Pri screen sys Rq key to put the current screen displayed on the screen capture down, then you can enter the drawing software or other software, you can press Ctrl + V to paste the screen capture just to the corresponding software. And QQ screenshot tool in the same function. Somewhat simpler that way.