Errr.. I basically use a laptop for everything so a lot of the key commands are off for me. I don't really have num-lock or prtscrn like those on a CPU do(Unless I'm just horribly blind.)
It's kind of annoying when I'm trying to take a screeny or clear my screen and people are like, "press numlok plz". Even more annoying when the options button doesn't do anything for you, either.