Hello, I'm running 10.9 on a 2011 iMac, and have a second monitor connected to it. Every time I take a screenshot, it takes a picture of the second screen too, though most times I have it off. A lot of screenshots start piling up and it's pretty annoying. Is there a way to get around this? I tried the command+shift+4+space, but that only lets me choose one window to screenshot. I only want to screenshot my iMac since it's my main window. Thanks everyone!