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Using iMac 21.5 mid 2010 as an external monitor of Macbook Pro Retina late 2013 15"? - Ask Different
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Retina 5K iMac Will Not Act as External Display, Standalone Apple 5K Display Unlikely Soon - MacRumors
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Apple iMac: Complete redesign incoming alongside a cheaper external monitor option, but Face ID must wait for a later iteration - NotebookCheck.net News
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