Vista AppData

In Vista, the biggest change in the arrangement of a user's settings is the creation of the AppData folder. Furthermore, this AppData folder has three subfolders, Local, LocalLow and Roaming. As with Local Settings, a folder called Application Data exists in Vista for backwards compatibility with XP.

If you look closely at the icons under the Users folder, you will notice that some subfolders have a shortcut arrow. These arrows indicate a Junction point or Symbolic link. For ordinary mortals stick with the idea that these folders represent shortcuts, for example, the 'All Users' settings are now actually stored here --> C:\ProgramData. As far as Microsoft's technical explanation of Junction Points and Symbolic links, it was a case of 'Guy is reading, but Guy is not understanding'.


source : http://www.computerperformance.co.uk