It's a Hotkey event driver for the Asus Notebooks with the WMI device ATKD in dsdt. This has been implemented by me to support Asus notebooks based on the source(from hokoffy, insanelymac) and linux source code.
Follow this link for details and download: http://forum.osxlatitude.com/index.php?/topic/1968-fn-hotkey-driver-for-asus-notebooks/