Not written yet. What exists today lives on the page that needs it: installing and the warnings each platform shows are on the download page.
Signing in, choosing which machine carries your traffic, reaching one machine from another by name, and sharing a folder. In the meantime the program says these things itself — every screen in it is written to be read without a manual, and where that fails it is the screen that is wrong.
If something is unclear and you cannot find the answer on a screen, tell us — that is the report worth sending, because it names a screen that has to change.
