The caps lock button, which causes everything you type to be in capital letters, is often pressed by accident. The results aren't life threatening, but having to retype a sentence or two can really tick me off. Many have looked all over the internet for a way to warn them when the Caps Lock key is mistakenly pressed.
It turns out that the answer is right inside Windows! Windows has a feature called "Toggle Keys". When the toggle keys feature is enabled your computer emits a beep when the caps lock or num lock keys are pressed, and a different beep when they are pressed a second time to turn them off. It's a feature I enable on all of my computers.
Turn on Toggle Keys in Windows Vista
Open Control Panel in classic view and double click on Ease of Access Center, which opens the window below.
Click "Make the keyboard easier to use", which opens the window below.
Halfway down you will see a checkbox and Turn on Toggle Keys. Click the checkbox to place a check and hit apply. Now each time you hit the caps lock or num lock keys you will hear a beep.
Turn on Toggle Keys in Windows XP
Click the Start Button>Control Panel>Accessibility Options, which will open the window below.
Place a checkmark in the box labeled "Use Toggle Keys" by clicking the box with your mouse. Click OK to close the window.