Faraclas,
A CSIDL is used in conjunction with one of four shell functions, SHGetFolderLocation, SHGetFolderPath, SHGetSpecialFolderLocation, and SHGetSpecialFolderPath, to retrieve a special folder's pathname or item ID list (PIDL).
You can look at the documentation for the above shell functions at this link that allows to retrieve these informations (bottom of the page):
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/shellcc/platform/Shell/reference/enums/csidl.asp
Regards,
Cyril Bouton
Applications Engineer
National Instruments
Cyril Bouton
Active LabVIEW Developper