Windows

You can sometimes use hidden shares, but this is tricky. Because of the way NT handles file and folder sharing, the best way to work with this is to set the shared folder at the lowest level that you want to share. For example, if you have subfolders for Commercial and Marketing within a main folder called Shared Folders, then share the Commercial and Marketing folders individually, rather than sharing the Shared Folders as a single share. Then, you can control by group membership who gets drives mapped to which of the subfolders. I know this seems counter-intuitive to some, but this is the way NT works. Hope this helps!