Not flame-baiting but I honestly fail to see how use of any one program over another would be more simple:

PrtScrn way:

1.) push Print Screen
2.) paste somewhere
3.) save

...

In Windows, simply push the "Print Screen" key, then open a program such as Paintbrush, and paste it in. For a single window, you can use Alt+Print Screen. This is really simple and doesn't support...