If you have an iMac made in mid-2011 or later, here is how you can use it as an external monitor.

Get a second-life from an old iMac by turning it into a monitor for a new Apple Mac computer. This feature shows you how to use one Mac's monitor as a display for another Mac.

If you have need to connect a second monitor to your Mac and have a spare iMac lying around, here's how to use an iMac as a second monitor.

If you have an extra laptop lying around, or want to use it alongside your desktop, here's how to connect and project your Windows screen to a laptop.

You could extend your PC or Mac display to a laptop screen. Learn how to use a laptop as a second monitor with Windows and macOS computers.

You have an old iMac that has a perfectly good display. Wouldn't it be great if you could use it as a second monitor with your new MacBook Air. You can, but you may be underwhelmed by the results.