Within the application structure, only one dialog executes at a time. The sequence of dialog execution within an application structure is called the application thread. The response of the user determines the dialogs that constitute a given application thread. A figure later in this chapter shows an application structure and one application thread.
One dialog can exist in several places within the application structure and be part of the same or different application threads. A dialog can execute more than once within the application thread whether or not it remains operative.
In the next figure, the boxes with dotted lines represent an application thread that includes dialog A, dialog C, and dialog D.
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