Question: I'd like to disable `ctrl`+`alt`+arrow keys changing the screen orientation. I've seen [here](https://superuser.com/questions/279756/how-to-disable-the-screen-orientation-hotkeys-in-windows-xp) that this is a function of the Intel graphics driver. So I followed the directions and `disabled hotkeys` in the `Intel graphics card control panel`, but the hotkeys are still `enabled`. Might there be some other program controlling this? I'm running a Lenovo T420.

Answer: 
Steps
1-Move the mouse to the screen & right click (you will see View, Sort by, Refresh, Graphics Properties...point to Graphics Options & Select Hot Keys.
2-Select Disable.
3-Now if you try to press [Ctrl] [Alt] + Arrow Keys the video screen wont rotate any more. For some reason you want to control screen rotation just Enable it again.
"hkcmd.exe" is Intel's "extreme" grahics hot key interceptor. If you never use the Intel hotkeys, you can go to Control Panel > Intel Extreme Graphics > Hot Keys and turn them off.

Get more detailed information about hkcmd.exe and all other running background processes with Security Task Manager.

Source:
<http://www.neuber.com/taskmanager/process/hkcmd.exe.html>

Good luck!