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.

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.

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

Many readers want to use an old iMac as an external monitor—it’s one of the most frequent Mac 911 questions! We previously provided an almost-comprehensive answer to the question before Apple ...

How to Share an iMac Monitor With Another Mac. A feature called target display mode allows you to share the monitor on your iMac with another Mac computer. This can be useful, for example, if you ...