Great screenshot, but what's that small application you're running on the right side? It has the buttons with 1-9, and has 1.239e+11 in the output window. I've never seen that one before.
That was just my version of a funny joke. (You know how everybody sees a screenshot, and says, "What's this program?" "Where'd you get that background?" "What's that icon?" and on and on.)
So I asked about calculator. Haha. Okay so it's not so funny.