When the Oracle Web Agent logs into the Oracle7 Server, it starts a PL/SQL procedure that has been created by the user to generate an HTML page as its output. The procedures and functions in the Developer's Toolkit generate the actual HTML tags, so that the user can be focused on the content of the application, rather than the specifics of HTML.
For detailed information on the routines included in the Oracle WebServer Developer's Toolkit, see Chapter 6 "Oracle WebServer Developer's Toolkit".