Hidden FoldersSynchronizer (H.FS) is an application entirely equal to FoldersSynchronizer (FS) but running in the background as a hidden application (usually defined as login item on the "System Preferences/Accounts/Login Items" list). It is very useful for performing automatic sync and backup launched by the timers in a mode full7 transparent to the user. When running, the user cannot see the application, cannot see its icon in the Dock, cannot select it, cannot configure it, cannot manually start or stop a task, and cannot quit it in the usual manner. H.FS simply works using the latest settings you have defined with the FoldersSynchronizer application. And it works only if you defined a timer with the FoldersSynchronizer application. H.FS is free for all the FS registered users.