Can you help me understand something about variables?
I'm trying to get to know FuelCMS and how variables are passed around between models, views, controllers etc.
I think I'm getting there, but I'm a bit puzzled about how the default 404 page works. In the 404 layout file it echoes fuel_var('heading') and fuel_var('body'), but I can't seem to find where these variables are set. There isn't a 404 controller or _variables file and these are not set in the global variables file, so where are the heading and body variables set for this layout?