Windows 8 creates a roaming profile in the C:\Users directory using xxxxxx_000 subdirectories for each Microsoft account which is created.

What are these roaming profiles and when they are used?

It is possible to rename these subdirectories manually?

It is possible to choose the names of these subdirectories when Windows 8 creates them?

Is there a way to make sure that these profiles are completely deleted when the user logs off from his Microsoft account?