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PL/SQL Agent has made improvements since earlier versions of Web Application Server. This improvement comes from the fact that each PL/SQL Agent instance stays connected to your Oracle7x database between incoming requests. The idea here is that there's no need to establish a new database per stored procedure execution. You should use the latest version of PL/SQL after doing isolation testing to make sure that you experience no side effects.
The PL/SQL Agent executes two tasks that allow your stored procedures to create dynamic HTML pages:
In addition to performing these tasks, the PL/SQL Agent includes the PL/SQL Web Toolkita collection of packaged procedures, functions, and utilities to enhance productivity and ensure valid HTML output.