+------+                           +-----------+
         |  App |<----- app flows---------->|Application|
         |Client|                           +-----------+
         +------+                                 A
                                                  |
         +------+             +------+       +--------+
         | Q4S  |<----Q4S---->| Q4S  |<----->|Actuator|
         |Client|             |Server|       +--------+
         +------+             +------+            |
                                                  V
                                           +-------------+
                                           |policy server|
                                           +-------------+