Geoff Chappell - Software Analyst
The IObjectWithSelection methods are (as ordered in the virtual function table after the IUnknown methods):
HRESULT SetSelection (IShellItemArray *);
HRESULT GetSelection (REFIID, PVOID *);
The IObjectWithSelection interface is implemented by the ExplorerFrame.dll and SHELL32.DLL version 6.0 from Windows Vista.
Though new for Windows Vista, this interface is not documented by Microsoft in the January 2007 edition of the Software Development Kit (SDK) for Windows Vista.