MaxiVista is a clever software utility that lets you turn a second PC into a second monitor. As long as both systems are connected to your home network, you’re good to go.

Does your desktop computer need some extra screen space? We can show you how to use your laptop as a monitor if you need a second display: Here's what to do.

However, a simple $10 app called Air Display can turn your Retina iPad into a high-resolution secondary monitor. It connects to your computer over your WiFi connection, and works with both Windows ...