Is it possible to extend a late 2013 iMac to an external display? - Quora
How to add a second screen on your iMac 2011 onwards - YouTube
Use iMac As Monitor for PC? How Does It Work?
Can I use a Mid 2011 27 inch iMac (Thunderbolt) as a display for a PC? - Ask Different
Trying to use my 2011 imac running high sierra as an external display for a OC via HDMI to miniDisplay port. Unfortunately I tried to book them up and using the windows (
How to Use Your Old iMac as a Monitor
Use your iMac as a display with target display mode - Apple Support
Using an iMac as a Monitor Is More Complicated Than You Might Think
Turning an iMac into a half-priced Studio Display - 9to5Mac
How to Use iMac as Monitor for PC [3 Cases] - MiniTool Partition Wizard