Alternatively, if he really doesn't have that key (seems impossible?) depending on which Operating System he's on he won't have to download anything.
Windows 7 has a snipping tool. You can get to it the simple way by clicking Start and typing in the search bar Snipping Tool. It will let you crop the screen and give you options of what to do with it.
If you're on a different version of Windows that doesn't offer that, an awkward work around is to run on-screen keyboard and use the key on it instead. Not sure if it will work the same or not, you may have the keyboard captured. I've never tried it, but it's worth a shot.
My name is Brian.