Inside Headers allow you to
add HTML at the top and bottom of each page.
This lets you change things on a page by
page basis.
Using inside headers you can also create
brand new pages.
For example. If you create an inside header
called 'welcome', and add the text 'Welcome
to my site' to the header, then save it. You
will then be able to go to the page
welcome.php on your site and view that page.
This lets you create your own pages, for
things like links and information.