Building a site with CodeIgniter

[eluser]Pascal Kriete[/eluser]
The keywords here are "through index.php". Index.php is the default entry point, but it does not have to be. For a different application you could use another file name, or a subfolder. As long as the cookie url is the same it will still work.

What a modular extension like matchbox will let you do is have several sections (also known as modules) in one application. So instead of application/controllers you have application/module/controllers. What approach you choose depends mostly on your needs.