IMAC as a 2nd screen
Can I link my IMAC as a 2nd screen to a windows laptop ? my IMAC is end 2012.
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Doubtful if the few limited target display modes would work,
to attach iMac (2012) to Windows-based portable computers.
However there may be some clues in this Apple Support article:
• Use your iMac as a display - Apple Support
https://support.apple.com/guide/mac-help/use-an-imac-as-a-display-mh30822/10.14/mac/10.14
(Depending which macOS runs your Mac: note three latest are referenced within this article.)
More info suggests this only may work between supported Apple computers:
• Use your iMac as a display with target display mode - Apple Support
https://support.apple.com/en-us/HT204592