'cuw_config_'  - prefixes all configurable variable names  *legacy variable*
'cuw_conf_'    - prefixes all API variable names
'default_if_'  - prefixes all interface defaults
'default_system_' - prefixes all system defaults
'if_<iface>_'  - prefixes all iface specific settings made by the user

API variables
-------------
$cuw_conf_backend - A named pipe, created by backend, written by frontend
$cuw_conf_file - the master configuration file
$cuw_conf_tmpfile - temp file prefix

# default_ keys are pulled in as default values when
# any keys are initially unset

default_system_hostname='cuw'
	already done
default_if_enable='yes'
	if set to "no" simply skip creating an /etc/ifconfig file for 
	this interface

default_if_hsls_discover='yes'
default_if_hsls_stub='yes'
	I think hslsd is re-configured by stopping it and invoking 
	again with different options.  I can't remember how those are 
	stored in /permanent/
	
default_if_ipv4_autoaddress='no'

	Stop dhcpselect and force dhclient mode.
	
default_if_ipv4_address='127.0.0.1'
default_if_ipv4_netmask='255.255.255.0'
default_if_ipv6_address='0000:0000:0000:0000:0000:0000:0000:0000'
default_if_ipv6_netmask='/64'

	If set, these are stuck into the /etc/ifconfig files.
	Perhaps this is easiest to do by modifying the existing $() calls.

default_if_ieee80211_ssid='cuwireless.net'
default_if_ieee80211_role='client'
default_if_ieee80211_mode='11b'
default_if_ieee80211_channel='11'
default_if_ieee80211_rate='auto'

	For the most part are simply put directly the /etc/ifconfig
	at boot time.  The 'role' decides which tmpl files are the base.

default_if_dhcp_enable='yes'
default_if_dhcp_iprange_start='10.0.1.2'
default_if_dhcp_iprange_end='10.0.1.99'
default_if_dhcp_netmask='255.255.255.0'
default_if_dhcp_leasetime='5'
default_if_dhcp_dnsservers='205.166.226.38'
default_if_dhcp_domainname='cuwireless.net'

	Stop dhcpselect and force dhcpd mode.

default_if_dhcp_routers='10.0.1.1'

Legacy Variables
----------------
$cuw_config_ssid
$cuw_config_channel
$cuw_config_nameservers     - a space separated list of nameserver IP addrs
$cuw_config_dhcpselect_mode - 'client' or 'server' or 'auto' 
$cuw_config_longitude       - These should simply be stored in the config
$cuw_config_latitude          file for now, no need to take special action.
$cuw_config_hostname        - a node identifier string

Added to /tmp config file by backend for use by frontend
--------------------------------------------------------
$cuw_conf_failures - list of variables which failed 
$cuw_conf_error    - human readable error string explaining failures