If you are using a Web module, it acts as a Web dispatcher. If you are using a pre-existing data module, you must add a single dispatcher component (TWebDispatcher) to that data module. The dispatcher maintains a collection of action items that know how to handle certain kinds of request messages. When the Web application passes a request object and a response object to the dispatcher, it is responsible for dispatching the request message. 

Set up the Web dispatcher by adding actions to the dispatcher.