The three files used for ZEUS

The three files (okay four if you count the css file) used are here:
File one is the php file that is served by the web browser that reads two files a default and unchangeable file (unchangeable by the web interface) to produce the final file.
File two is a file which is just read by the php file and can be used as system defaults.
File three is the variable file, in which the changes made by the web interface are stored.
The fourth file here is a css file that is optional.These files are used to write to the final file such as /etc/aliases. The final file needs to be writeable, although you will get warnings for any incorrect permissions.There is a demonstration of the GUI here.