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.
Right-click the folder that you want to share, and then click Share. The File Sharing window is displayed. If you have password protected sharing enabled, use the File Sharing window to select which users can access the shared folder and their permission level. To allow all users, select Everyone in the list of users.ight-click the folder that you want to share, and then click Share. The File Sharing window is displayed. If you have password protected sharing enabled, use the File Sharing window to select which users can access the shared folder and their permission level. To allow all users, select Everyone in the list of users.