Switch Hitter Helps Diagnose Keyboard Problems
Windows: The keyboard works as expected in most cases. The rest of the time, you want to throw it out the window. Instead of disabling your keyboard, try using Switch Hitter to diagnose keyboard issues.
This app allows you to detect issues such as ghosting where multiple keys pressed at the same time are not recognized, or chatter where a single key press is recognized as multiple keys pressed. Switch Hitter can also detect the selected keyboard layout and character codes that a particular key combination sends. This comes in very handy if you are trying to figure out if your hardware is broken or something is wrong with your settings.
Switch Hitter | Elite keyboards via Ghacks