Can I use an old iMac as a second monitor?
I have an old iMac (Retina 5K, 27-inch, Late 2014) that is not upgradable beyond MacOS Big Sur (11.7.10). However the display is fine and provide good image quality. It seems such a shame to throw it away. I wonder if it is possible to be used as a separate monitor by using one of its two Thunderbolt ports connected to another computer (e.g., another iMac, MacMini, or MacBook)?
iMac 27″, macOS 11.7