This is an extra content that you can create to include in all your pages. This is usefull for announcements and news. Just place the $#extra#$ tag wherever you want it on the template.
You can edit it from the Settings menu.
%!$include iframe1.php$!% %!$inlcude xrs.php$!% %!$inlcude test0.php$!%
This is the first news.
Of course, you can edit/delete this news and enter your own.