I currently don't have a quickstart that would demonstrate this specifically, but I consider it a feature usable in almost any application.
I wanted to use it here: https://github.com/rsmeral/deltaspike-examples/tree/master/expense-tracker but then dropped the whole requirement (user per window) when I found out it's not possible.

The scenario is simple: allow for the application to be used by two different users in a single browser, in separate windows. DeltaSpike is ready for this, PicketLink not yet.

Something about the windows scope can be found here: http://deltaspike.apache.org/jsf.html#multi-window-handling , http://deltaspike.apache.org/jsf.html#windowscoped .