Well, I did something right because I now have it all set up. I was downloading some Windows updates while I started this thread and after the computer rebooted I had an image on both the monitor and the TV. I had to change the resolution and set the same image in both, the TV showed the mouse pointer, icons and the like, the monitor just had a picture. Also quite by accident I figured out by double clicking on the image of the monitor before it rebooted after the updates that it's AMD Radeon HD7480D graphics.