It's a private API CGVirtualDisplay, but mostly well reverse engineered. Here's one example I found of a wrapper library https://github.com/enfp-dev-studio/nod

It's a private API CGVirtualDisplay, but mostly well reverse engineered. Here's one example I found of a wrapper library https://github.com/enfp-dev-studio/node-mac-virtual-display/blob/main/src/virtual_display.mm https://github.com/enfp-dev-studio/node-mac-virtual-display/...