
This cable worked great to connect my new 2020 Macbook Pro with Thunderbolt 3 port to my old iMac (Mid 2010). 2010) to be connected via the display port. I hooked it up to my iMac, then to my Macbook, the screens flashed, and then my iMac was automatically added as another display! I didn't have to do anything. I accessed System Pref ---> Display to change the orientation of the two displays with iMac on top and Macbook on bottom as they are side by side by default. This worked with my iMac whether I logged in or not. So basically it was a plug and play solution, which is great. FYI, this is a display only, you cannot access data on an iMac.