.Net 4.0 different AppDomain managers for different AppDomains

Whilst looking through the latest documentation for the AppDomainSetup class I see that you can now specify a new AppDomainManager object for each application domain that you create. This removes the duality of the pre 4.0 AppDomainManager as the manager that you specify when you start the CLR can now deal solely with the requirements of the default application domain and it can set a new AppDomainManager object for each application domain that it creates.