Memo to myself:

 In order to implement a central registry of hostnames+usernames,

 GROUP name - if in capitals, its default expression is just that envvar.

:HOST:
	host_ftp=false
	host_gopher=false

	www.some.co.uk, 194.200.167.4
		:VHOST:
		HTTPROOT=/etc/www
		
		:USER:
			HOME=/home/$USER
			deny_login=false
			deny_ftp=false
			deny_samba=false
	
			warwick	
				unixpw=k3/5v0xm6nak.
				deny_ftp=true
				UID=100 GID=100:80:81
			ian
			john
		::USER
	::VHOST

www.claymag.com, 194.203.7.18
	:VHOST:
		INTERFACE=eth0:1
		HTTPROOT=/etc/www/www.claymag.com
		MAILHOME=/home/pop/externs/$HOST/$USER
		MAILDIR=$MAILHOME/Maildir
		POSTMASTER=somelocaluser

		:LP:
			text
				df=3 kj=k
		::LP

		:USER:
			
		::USER
	::VHOST
::HOST