I seen to remember, back in the dark days when I was first learning Blender, I read that it was possible to make a mesh into a reference object - ie unselectable - by putting it into a new scene file. It would be visible as a wireframe - but not selectable. I can’t seem to get this to work. Any ideas?
In the Render panels, above the Backbuf button there is an orphan-looking dropdown menu. Open this and select the scene you want to link to the current scene.
That’s it! Thanks. Jeez, I would never have got that one on my own. I’ll not forget it now though. 