RelaX

To your clipboard, so you can CTRL + V (paste) it anywhere you like. If you want to save it just use your default bitmap editor or Paint.

I'm actually surprised that no one has mentioned the CTRL combos.
CTRL + C - Copy
CTRL + V - Paste
CTRL + Z - Undo

And most progs also have:
CTRL + S - Save OR
CTRL + O - write Output

Or maybe everbody already knows...

__________________
The most likely way for the world to be destroyed, most experts agree, is by accident. That's where we come in; we're computer professionals. We cause accidents.
- Nathaniel Borenstein