It is called a "theme", which does not refer in any way to the general layout of the page.
That theme is defined by a simple theme file stored in /packages/new-portal/www/themes, and affects only the portlets style.
Here is an example of this file
[caption=sloan-theme.adp]theme-listing.txt
What is important to notice in this code is :
- name : this is the title of the portlet
- slave : where the result of the portlet will be placed
This gives this html result (sample of the index page) :
[caption=index.html]index.txt
Jeremy Monnet
2005-07-18