> There is no "current directory" on an UNC share

SetCurrentDirectory allows setting the current directory to a UNC share. https://learn.microsoft.com/en-us/windows/win32/api/winbase/...

> Also wrong, it's not the command line shell that keeps track of the current directories, it's the Windows kernel itself. But I agree that such a scenario is quite useless as you can never be quite sure on what CWD you are on a given drive

Not for a long time. It's set as a special (hidden) environment variable like `=C:=C:\current\directory`. https://devblogs.microsoft.com/oldnewthing/20100506-00/?p=14...