There was a screenshot function in DD (ctrl-F11), but for some reason it didn't make it into BD. The only options (unless this feature gets added in some future patch) are alt tabbing or using another program.
If it is like age of empires it might have a cool feature such as being able to use binded keys were it would save in the gamesown folder....Try alt+ctrl+f12+ prntscrn I doubt it'll work though <img src="/ubbthreads/images/graemlins/sad.gif" alt="" />
~ZwiTTeR...Not even death can save you from me.
Screw magic I like to go with the brute force, slashing and crushing my enemies to oblivion.