Basically, what short cut command makes it so that if you press "D" for example on the keyboard makes it highlight, for example "Day of Defeat" on the desktop.
It's quite annoying because it will make me unable to type letters like "D" or "C" in game like Mount and Blade: Warband in multiplayer. To fix it I have to restart my computer.
:EDIT: It also makes me unable to open the Windows menu through the Windows key for some odd reason.