The following flowcharts illustrate the most common user exit functions used to modify the user interface. The flowcharts are designed to help you see the coordination of processing between the client and the server as well as where the pre and post external user exits can be used.

The following diagram explains the shapes used on subsequent flowcharts:

Whenever you see a request for a server-side page service, you can refer to the Page Maintenance Program flowchart to see the server-side processing. You can determine the Page Action based on the service being requested: Read, Add, Change, Delete, or Default.