From the horse’s mouth
Switch Hitter Keyboard Diagnostic Software (Product Download Page)
You may find that your computer’s keyboard may not be behaving in a consistent manner and this may be an issue that may have you taking your laptop computer in for warranty service or buying a new keyboard. Or you find that you are losing those battle games and find that the keyboard isn’t allowing you to demolish the enemy.
But there is a Windows utility that helps you to troubleshoot your keyboard. Switch Hitter gives a visual display similar to a touch-typing tutor program to show whether any of the keys are responding as you press them and identifies which keys are stuck down. This can also work with identifying contact-bounce problems which surfaces as repeated keypresses as well as keys that don’t respond and can be symptomatic of a keyboard that has had the life bashed out of it.
It also shows up which keyboard layout you are using and what keystroke combination you are sending, which may be an issue with area-specific layouts.
This can allow you to supply to a repair agent a more qualified diagnosis of the problems you are having with the keyboard, especially when it comes to that warranty service. As well, you can know if you are actually dealing with an improper setup, a dodgy keyboard-computer link or a keyboard that is to be replaced.
This can also be used to check whether that gaming keyboard is being responsive and satisfying the claims that the manufacturer is touting, thus being suitable for that online fragging session.