The "/etc/rc" (resource configuration) script executes rc.* files during the last phase of the bootstrap. FreeBSD has a very nice feature which is referred to as startup directories. These directories are 'user' defined in "/etc/rc.conf". If you look in "/etc/defaults/rc.conf" you will see a line like this:
	local_startup="/usr/local/etc/rc.d /usr/X11R6/etc/rc.d"
	# This setting determines which directories are scanned for
	# shell scripts at startup. Executable files within these
	# directories are run in alphabetical order.
     If you want something to be started at boot time, create a file which ends with ".sh" in a startup directory. At boot time, each file ending with ".sh" will be executed. The order of execution is alphabetical. If you need the files to be executed in a specific order, try numbering the files. For example:
	000This.Will.Run.First.sh
	020This.Will.Run.Next.sh
	030And.Then.This.sh
     Most BSD default startup files are located in "/etc" all start with the prefix "rc.". The master configuration files are "/etc/defaults/rc.conf", and "/etc/rc.conf". The "/etc/rc.conf" file is the user editable file. The "/etc/defaults/rc.conf" should not be modified, all settings in the "/etc/rc.conf" file will override it's settings so the administrator should make all changes in "/etc/rc.conf".