Hickory: There is, but not physical files on the hard drive. If you use fake fullscreen you can use PrtScrn key to capture your shot to the clipboard, then ALT/TAB out and paste it into a graphic program. Though some people may have issues with fake fullscreen. The attached shot was just taken with the PrtScrn key and pasted into Gimp.
tx3000: Print screen screen is a thrird paty aspect which is exactly what I said. And print screen doesn't work if you try to use ctrl+v to past it into an empty bmp or jpg. I know I tried it
The topic creator was asking if there was a hotkey in the game itself
Just how hard do you work at being a complete fool? PrtScrn is not third party. PrtScrn is a button on your keyboard. To take a screenshot, in any game, no matter what method you choose, you have to press a damned button. PrtScrn is a key on most keyboards that sends the current screen to the clipboard (or printer, depending on OS and setup).
And of course you cannot paste the clipboard directly into a bmp or jpg, you have to use your graphics editing program, just like you have to paste text into a document editor.