2017 4K, 5K iMacs won’t support Target Display Mode, despite Thunderbolt 3

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Apple has definitively stated that new 2017 iMacs will not support Target Display Mode, a feature that previously allowed some iMac models between 2009 and 2014 to use their built-in display as an external monitor for another Mac connected via Mini Display Port or Thunderbolt.
AppleInsider – Frontpage News

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