When a script completes, the browser-bound output of the script is stored in the {TEMPLATE} substitution variable, any messages (database errors, invalid passwords, etc.) are stored in the {MESSAGES} substitution varible and then the content retriever is called to deliver the page content to the browser.

Notice that even though the page consists of five hypothetical sections, the number of calls from the content retriever is greater than the number of page sections. This allows for the separation of the data display and input areas of your pages from the actual html structural elements which shape and define the layout of the pages.