This feature allows certain iMac models to function as external displays for another Mac. Connecting the two computers with a specific cable enables the iMac to mirror the primary Mac’s display or extend its desktop. For instance, a MacBook Pro could utilize an iMac’s larger, higher-resolution screen for tasks requiring more visual space.
The capacity to leverage an existing iMac’s display offers a cost-effective alternative to purchasing a separate monitor, particularly beneficial for users requiring a high-quality, large-format screen. This functionality was introduced over a decade ago and, while no longer available on newer models, remains valuable for users of supported hardware. It provided a unique integration possibility within the Apple ecosystem, streamlining workflows and maximizing hardware utility.