Does the button Render Daemon in Blender work? How?
No, that was set up for when Blender did external network rendering. I don’t think it actually serves a function anymore.
I thought I read somewhere that all it ever did, and I believe does now, is to tag that scene as one that should be rendered by renderd/brokerd. So, only useful if you have more than one scene in a .blend.
I think it worked that way for me, at least its rendered the scenes I tagged that way. Might have just been coincidence though, as in I saved the file with that scene active so renderd/brokerd rendered that one.