A link is a type of flow in which control and, optionally, data pass from a source procedure step to a destination procedure step, and back to the source procedure step.
The destination procedure step returns control to the source when the destination procedure step is complete. Data also may be passed to the source procedure step when control returns. In addition, all data known to the source procedure step when it originally executes is saved and made available after the destination procedure completes and returns control.
In the DLG, the link and return to a procedure step is represented by an arrow with a circle at the end. The arrow points to the destination procedure or procedure step. The circle indicates control can return to the originating procedure.
In a client/server application, the dialog flows from client procedures to server procedures must be links. Links are required to ensure that system control returns to the client when server processing is complete.
Link and transfer arrows on the DLG point up and down to illustrate the transfer of control. The DLG groups together all arrows flowing from one procedure or procedure step. If the procedure step is near the top of the diagram, the arrows flowing from the step appear on the left side. If the procedure step is near the bottom of the diagram, the arrows flowing from the procedure appear on the right side.
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