Late 2015 iMac supports extended desktop but can't be used as an external monitor?

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Late 2015 iMac supports extended desktop but can't be used as an external monitor?

I have search the discussions and articles before asking this. It is clear that my iMac late 2015 can NOT be used as an external monitor for a MacBook. But the tech specs clearly say it supports "extended desktop" which is just that, is it not? This is from Apple:

"Video Support and Camera

FaceTime HD camera
Simultaneously supports full native resolution on the built-in display and up to two 4096-by-2160 external displays or one 5120-by-2880 dual-cable external display
Support for extended desktop and video mirroring modes"

So it can be transmit to two other displays - that's is clear, but the last line suggests it should be able to be used as a display.

Some mentioned setting up a virtual network as a work around I welcome's all advice. My iMac has Mojave, but I can go back to a prior OS if needed. I am looking to purchase a newer MacBook so i can get "2 for one" but using my iMac as a display for a bigger desktop type screen when at home. Thanks!!!

Posted on Aug 12, 2021 1:34 PM

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Answer 1

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padams35

Level 4

3,343 points

Aug 12, 2021 2:25 PM in response to Swaim

"Extended desktop" refers to extending the 2015's desktop onto an external monitor (as opposed to screen mirror or using the external monitor as a separate space).

That line does not refer to using the 5K as a display for another computer.

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Answer 2

den.thed

Level 9

78,616 points

Aug 12, 2021 2:06 PM in response to Swaim

The 2015 iMac does not support being used as a display for another Mac.

please carefully read > https://support.apple.com/en-us/HT204592

Screen Sharing or something like Luna Display are your options.

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Answer 3

Swaim Author

Level 1

60 points

Aug 12, 2021 3:33 PM in response to den.thed

please carefully read > https://support.apple.com/en-us/HT204592

Thanks. As noted, I had read all the info (including this article). I just thought there might be a work around as I did NOT understand what "extended desktop" was; I could not find a description of what that meant. It is strange that this ONE model was left without that option when models before AND after support mirroring none fashion or other.

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Answer 4

Jack-19

Level 8

45,872 points

Aug 12, 2021 1:37 PM in response to Swaim

No macOS version will allow it to be used a display for other devices.

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Late 2015 iMac supports extended desktop but can't be used as an external monitor?

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