What are “User Process Components”?

Question

This article about application architecture design mentions "User Process Components" as part of the presentation layer.

User process components. Your user process components help synchronize and orchestrate user interactions. This way the process flow and state management logic is not hard-coded in the user interface elements themselves, and the same basic user interaction patterns can be reused by multiple user interfaces.

It looks like this is a standard term, but I have never heard of it so far. Can you provide a more precide definition or examples of UPCs which illustrate the definition above?

EDIT: what's puzzling me particularly is the phrase "help synchronize and orchestrate user interactions". Can you provide an explanation of what could be meant? Can you give an example of a problem that is solved using UPCs?