Thats not much help, have you tried it since you made the video ?

because its not working, is more needed to be added/done ?

Im using 5 clients on 1 pc, I tried this while having only 2 open, 1 the healer, other the dpser, did it exactly same way as said in video,healer screen was the source, dpser screen was the viewer and it doesnt turn out like the video at all.

Just green transparent boxes