This White Paper presents research on how App-V 5 performs client side layering of file and registry systems. In particular, the paper shows how "Connection Groups" works at a detailed level, including Pellucidity of containers and the effect of package deletion objects. In the tests described in this paper, we see that the implementation of Connection Groups, while a good improvement over DSC in the prior versions, is not consistent. A full understanding on how the product actually implements this layering is necessary to understand and overcome issues that can develop when using Connection Groups. This paper replaces the DSC White Paper that was written against App-V version 4.6.