Could you add a short description here about this class. I think there's a lot of useful information to contextualize that make to add here: relationship between Application and the other objects, including Runtime, RenderProcessHost, and etc.

I'm aware of the downsides of repeating the same information (one could just read the code), but a short description is worth for the following reasons: some redundancy is part of learning and understanding, it will make easier the life of other contributors less familiar with the concepts, and it serve as a sanity check to see whether the class stopped to do what it was expected to do or went to big.