HP A6000N DVD Tray open/close via non-HP keyboard hotkey?

I have an HP a6000n. I'm not using the keyboard that came with it, as
I have a Microsoft Natural 4000 Ergo keyboard, which I prefer.

My keyboard has 5 vacant hotkeys, which can be programed to follow ANY
link.

I note that the HP keyboard has a key dedicated to optical drive open/
close.

I would like to program one of my keyboard's hot keys to have this
functionality.

Does anyone know where to find the script/program that performs this
function?

I do have the latest HP keyboard-related files on my drives, including
a /kbd folder, but I can't seem to determine which program performs
the function of opening and closing the drive tray.

Anyone know there this guy is hiding?

Thanks.

David