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I have two macbooks:

  • MacBook Pro 2012
  • MacBook Pro 2017 with touchbar

Recently I've got an idea to use 2012 as a secondary display. I don't completely understand whether it's possible or not, the only info I found on this is https://www.macobserver.com/tips/how-to/imac-secondary-display/ It's said that this is possible if your second mac has thunderbolt or mini display ports. My 2012 does have it (mini display port). So let's consider it's possible.

It's said I need mini display to usb-c adapter. It's ok but not quite cheap. So finally we reached my question. I already have minidisplay to hdmi adapter. Now I'm wondering is it going to work if I purchase usb-c to hdmi adapter (since it's twice cheaper) and try to connect both adapters to each other?

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No.

Unless explicitly mentioned in the official specifications for the machine, it can't. For this machine it is https://support.apple.com/kb/sp649

You might find Synergy an interesting alternative as it allows you to use both machines at once. https://symless.com/synergy

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Yes. There’s product called Luna Display that a hardware solution that allows you to use a Mac or an iPad as a secondary display.

Use any Mac as a second display — perfect for anyone with multiple Macs. It also works on older Mac models

I’ve personally seen this work - I wouldn’t use it for gaming, but as a secondary display it’s pretty good.

What you were looking at in the linked article is called Target Display Mode and you need a supported iMac to make that work.

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  • yeah, I saw Luna project when was googling my question. It definitely solves my question. But I have some concerns about its performance since it has not only hardware but software components as well. I had an experience of using software solutions before (specifically apps.apple.com/app/duet-display/id935754064) and it was not the best experience (I connected iPad pro as secondary display then). There were often some freezes and slow reaction on user input. After Catalina was introduces I moved to its native solution of screen extension and it is the best solution I've ever tried. – heximal Aug 9 '20 at 20:42

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