User Interaction and Dialog step - same?

user Interaction step and dialog step- do they represent same meaning or different meaning. If they are different do let me know what the difference

A dialog step is simply a single request to a dialog process, so it's about the same meaning as user interaction, but not all user interaction produces a dialog step (some of the interaction is GUI only) and not all dialog steps are user interaction...
The smallest unit of work in an SAP system is called a dialog step. Every time a user is navigating through a menu, is printing a document or searches in the database, the tasks are processed by one or more dialog steps. Therefore a single R/3 use interaction is called a dialog step. It comprises the filling of a screen template and submitting it by pressing the return key or a function key respectively. An R/3 transaction (or business transaction) is normally made up of several dialog steps. The term dialog step is used also for non-dialog proceedings, like update or batch.