To turn on caps lock: Hold down ALT and the search key (which has a magnifying glass icon on it) — this will make a confirmation message appear in the bottom-right corner of your screen.

An icon with an up arrow with a line under it will appear in the notification area at the bottom right of the screen when it's on. Hitting those two keys again will turn caps lock off, as will ...

Own an HP laptop and hate the big Caps Lock icon that's just started appearing and taking over the screen when you press the key? There's a cure thankfully.