[Nautilus-list] How do Nautilus locations that end in a colon work?

["Mark Sobell" <mark sobell com>]

I am trying to figure out the correspondence between the Nautilus
locations that end in a colon (such as start-here:) and the filesystem.
I found /etc/X11/starthere and /usr/share/control-center, but cannot
correlate the rest of what I see in the Nautilus Location bar with the
directory structure. Would someone explain this to me? Thanks,
 
                  Mark Sobell
                  mark sobell com