One of my favorite casual gaming setups is to use a slim laptop on my couch while streaming from my desktop using Steam Remote Play. The downside though is that unless I want to get up, Steam needs to be already running on my desktop. This post describes how I start steam remotely from my couch so that I can stream my games without having to get up and set it up on my desktop first.
This requires you to be already logged into a graphical session on the computer you want to stream from.
On Linux, there is a DISPLAY environmental variable which tells X11 where to show the application. By default (at least on Ubuntu), the display starts as `:0` and moves up in count. We can make use of this fact, to start steam on a X11 server instance that is already running so that we don't have to do any X11 forwarding.
