Use your iMac as a display with target display mode - Apple Support
The Dual iMac Setup - YouTube
How to Set up & Use Dual Monitors on a Windows PC or Mac
Phillip Caudell on X: "I wanted a second display for my iMac but seeing that 1) Apple doesn't make a reasonably priced display and 2) all 5K options look hideous (not to
How to add and use a second monitor with your Mac | AppleInsider