No, it isn't used. We are only using manifestURL. But that actor will be handy if we make a smart client code.
For now, it list all apps and create actors for all apps. Instead we should watch appOpen and keep the actor, or save listApp result.
If we go the appOpen way, this actor will be usefull. That makes me wonder if we should create a getActor request and create actors only on explicit demand? As the usefullness of having the actor on listApp and/or appOpen really depend on the client implementation.