My laptop's keyboard is prone to buttons sticking. The fix is to just press the same button again.

Now when it is the letter/number keys are stuck, it's just a matter of putting the cursor in a text field, and seeing what characters appear.

However, when it is one of the modifier keys, or tab, or enter or a few other buttons, it gets harder to tell which key is to blame. Trying to type can result in all sort of shortcuts being triggered. Is there anyway to test what input is being recieved?

Also, I'm guessing this is a hardware issue, but if anyone knows of any possible causes/solutions it'd be appreciated. It's a Dell Studio 17, and the problem occurs under Windows and Linux.