The controller.jsp (Java) and controller.aspx(.NET) module is the entry point into the UI reference implementation. It receives the browser request from the application server, formulates the MDEX Engine query, establishes a connection with the MDEX Engine and sends the query. Based on the contents of the query results, the controller module determines whether the request was a navigation, a record, or an aggregated record request. For navigation requests, controller forwards the request to the nav module.