I am using SHGetFolderLocation to get an IntPtr to the Desktop folder,
I have declared it as follows:

//    SHGetFolderLocation
[DllImport("shell32.dll", EntryPoint="SHGetFolderLocation",
SetLastError=true, CallingConvention=CallingConvention.StdCall)]
public static extern int SHGetFolderLocation(IntPtr hwndOwner, int
nFolder, IntPtr hToken, int dwReserved, ref IntPtr ppidl);

The help file says:
       
The calling application is responsible for freeing this pointer with
the Shell's IMalloc interface (see SHGetMalloc).

Do I need to free the pointer returned in ppidl?
I don't use SHMalloc, in fact I'm sure I read in the help that it
shouldn't be used any more (?just in .NET) and to use Marshal instead.