Screenshots with ZScreen

After searching around for a good screenshot program, I noticed lots of people recommending the program ZScreen. It was free, so I tried it. Seems pretty nice, lots of options for what kind of screenie to take, though. But I still keep getting pictures of my desktop (you can see the NTW icon running at the bottom)
I was assuming NTW screenshots would be taken with the standard "entire screen" type (the button is print screen, by default), but should I taking shots with "active window" (alt+print screen) or "selected window" (shift+print screen) instead?

steam now has a screenshot function. hit the F12 button in game and it takes a screen shoy. you can take multiple screenshots each session. when you close the game the steam screenshot window opens up and you can save or view the screenshots. this works in offline mode. if its not enabled go into your steam acount and enable it