A simple one of usecase to demonstrate router usage in taskflows with only jspx pages ( no frags )
main page with 2 commandmenuItems employees and departments.
upon clicking employees menuitem should navigate to employees page and similarly clicking department menuitem should navigate to department page, all pages are in droped in there respective taskflows.

emp.jspx
dep.jspx
emp_TF.xml
dep_TF.xml
mn_TF.xml ( main taskflow calling emp and dep TF's through router )
adf-config.xml ( main page navigates to mn_TF.xml ).

Here is the screen shots..