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Yesterday I brought a iMac (Retina 5K, 27-inch, 2017) which has two ThunderBolt 3 (USB-C?) ports. I also have a MacBook Pro Late 2013 which has two ThunderBolt 2 (I think) ports. If I buy a ThunderBolt 3 to 2 cable. Would I be able to use the MacBook as a second monitor?

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If you mean Target Display Mode, then no - that was a feature only available to a select few iMac models & now defunct.

See Apple KB - Use your iMac as a display with Target Display Mode for details.
It was essentially available on iMacs between 2009 & 2014.

  • Ok great, thanks for letting me know. Is there any other way to achieve the same goal. I noticed Duet allows me to use a iPad as a second screen. Is anyone aware of anything simular for MacBook Pro's? – Grant Smith Jul 21 at 10:28
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As Tetsujin accurately states, you cannot use your MacBook Pro in Target Display Mode nor achieve the same result via a ThunderBolt 3 (USB-C?) to ThunderBolt 2 cable.

However, there are other options you can investigate, but I have no personal experience with them. Two of these options are listed below:

In summary, they promise to allow users to share their Mac screens on a variety of devices, including other Macs.

  • You could also use VNC to share out a screen on your iMac to the MacBook. – Thomas Nelson Jul 21 at 20:23

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