Choose a Flow Action

Whenever a flow takes place between procedures in either direction, the procedure to be initiated begins in one of the following ways:

Display First—This option shows the window or dialog box associated with the destination procedure and waits for user input to begin the logic of the procedure. Display first can be set only if the procedure is designated “online with a display” and contains a window or dialog box. A procedure that meets these criteria is a client procedure.
Execute First—This option executes the logic of the procedure, which results in either the display of the procedure's window or dialog box or the execution of a flow. The distinction relies on the definition of a flow action associated with each procedure.

These are the guidelines for selecting a flow action:

If the destination procedure requires information from the user before it can execute, the Display First option is used.
If the procedure is a server, which contains no windows or dialog boxes, Display First is not an option.
If the source procedure provides all the information required by the destination procedure, the Execute First option is used.