>1) Can I avoid that a user can call CREATEOBJECT directly, bypassing the GetSingleton method ?
>
>2) Can I avoid that a user redefines the Init method in the subclass ?
>

Um. The user wouldn't call the object nor redefine the init. A programmer/developer does that. If you're building a class for programmers to use, you have to trust they'll use it as intended and only expand it along those lines.