navigational state change

[Wesley Budziwojski <Wesley.Budziwojski@Sun.COM>]

Section 3.12

"Examples of when one of the optional steps (performBlockingInteraction 
and handleEvents) might not be used include:

    * The End-User interacting with a URL that simply looks to render
      the Portlet's markup with a different navigational state (e.g.
      with the next set of results from a search). In this case, both of
      the first two steps could be skipped. "

It seems that  to render Portlet's mark-up with a different navigational 
state implies that  Portlet needs to change its navigational state and
 if so the change of the Portlet's state should happen in PBI or there 
is no navigational state change in this use case?

Thanks,
Wesley