Laptops are great, but you don’t have to limit yourself to a tiny laptop screen — especially when you’re using a laptop at a desk. Adding a second screen is easier and cheaper than ever. The same is ...

Portable monitors keep getting cheaper and they're great for adding more screen space on the go—not just for laptops, either.

But if you only see a blank area of your desktop, without any open windows or a menu bar, try hitting the Command and F1 keys to switch OS X back to mirroring the built-in screen. You could also use a ...