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: 
Another option is to disable the `Intel(R) HD Graphics Control Panel Service` altogether. Or don't have it be started automatically.

See more info [here](https://communities.intel.com/thread/51399?start=15&tstart=0).
"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!