[tom_]

Depends on the program! - I've never minded using Emacs that way, even just over wifi, but a lot of more modern stuff is basically unusable. (I assume these programs draw everything to a local buffer, and then copy that to the screen. Probably fine locally, and I'm sure you do get more control, but it's a lot of data to go over a network!)

[jcelerier]

in my case it's Strawberry which is a modern Qt 5 app. I also tried retroarch that way and it works surprisingly well.