ActiveHotkeys is a portable application that surveys your system and returns a list of global hot keys. It detects what global keyboard shortcuts (hotkeys) are currently registered on the computer by various applications. This helps you determine which hotkeys are in use, and which are still available.
There is one limitation of the software and the application author has even specified it but its no fault of the author. Windows doesn’t keep a record of which hot key is assigned to which application, so it just shows what are currently assigned. So you might have to do some work to see which keys are used and which are not by an application which is not running at the moment.
ActiveHotkeys is a freeware Windows only application.
Download: ActiveHotkeys (509kb)