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Do both computers have to be running High Sierra or earlier, to use this with a Thunderbolt 2 connection? If so, how can I use a 2012 iMac (High Sierra) as an external monitor for a 2014 (Catalina) MacBook Pro? Thank you.
MacBook
FWIW, there is an updated Target Display Mode page.
FWIW, there is an updated Target Display Mode page.
No.
Target Display Mode OS question
