More info about shutdown sequence

[Scott Tuc Ellentuch at T-B-O-H]

Hi,

	I'm looking for more information about the entire
shutdown process. I know the rc.shutdown runs, but what/where
does it go from there? I need to run something when the 
filesystems are mounted read-only. Does FreeBSD ever get 
to this point?  Where? 

		Thanks, Tuc