About template context and global architecture...

Hi,

I was studying corporate_portal_template for 2 das and I saw the first HTML
page is "header.inc", and the last is "footer.inc". Is there a name
convention for this JSP filenames?

Does an overall JSP page exist? Between this two JSP files how does it work
for main page template integration? I read the JAHIA TEMPLATE DEVELOPPER
GUIDE and page 6 said there is a Jahia Servlet calling JSP Templates, but
is it alwas the same, and what  filename is it? Is Jahia webapp a Model2
(MVC) architecture ? What is the JAHIA servlet controller of MVC? What is
the JAHIA model of MVC?

Thanks.