Geoff Chappell - Software Analyst
The IFolderType interface has just the one method (after the IUnknown methods):
BOOL ProcessNotify (IFolderNotifyType, PCWSTR, PCWSTR);
in which IFolderNotifyType is an undocumented enumeration.
The IFolderNotify interface is implemented in the NT builds of SHELL32.DLL version 5.00 and higher.
Though this interface dates from 1999, it was still not documented by Microsoft as late as the January 2007 edition of the Windows Vista Software Development Kit (SDK).