If you take a look at your laptop's keyboard, you'll notice that the top row keys have icons printed above, with "F" and a number, like F1, F2, and so on, below each one. These are known as function ...

There are different ways to change the screen brightness, but the easiest way is to use the function keys. PCs of different brands have different function keys to control screen brightness. In this ...

For a function-key use that makes sense, but not for the sublegend for say = and + where they're both "valuable" keys. You get used to primary on the left, secondary on the right pretty quickly anyway ...