Jimbob, the
left side! {you know, the one where the thumb is on the right
}
It is Touchbuddy, awesome freeware tool
http://www.touch-buddy.com/ sometimes their server is down, you may have to wait and re-try.
Originaly made to use on a second touchscreen you may connect to your PC, I chose the easy way (window besides my CoD).
I use it mainly in order to control the complex bomb setting modes when flying bombers although the BAIL OUT key has seen the most usage to date...
but you can do very complex setups:
~S~