Members of the site each have a user profile and can upload research output including papers, data, chapters, negative results, patents, research proposals, methods, presentations, and software source code. Users may also follow the activities of other users and engage in discussions with them.
Here is the official word from Microsoft TechNet, The C:\Users folder is shared when any sub folders from C:\Users\<username>\ is shared. The article is stale and mostly unhelpful, but worth knowing to complete the story.
To share a file, Qbox first syncs the file up to the Qbox cloud server over the Internet and then syncs it. down to the Qbox folders on the other user[s computer. Thus, Qbox makes sure that all users have. identical copies of the file. When a user wants to make changes to a shared file, Qbox acquires a File.