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Can I Use a 2010/09 iMac As a Second Monitor.

I would like to purchase a 2010/09 iMac & use it as second monitor with my late 21.5″ 2015 iMac, which is not a 5K or 4K, & what cables would I need.

Many Thanks.
—–
Jim Harrison South Wales, UK

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    9 months ago
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