Thanks for the reply, that's exactly what I'm doing, but some times while the page is changing, and the program saves titles, root directory and page number, a little slowdown access appears and I think this will be more noticeable when the file is storing a colleccion of books and paths. That is a fisical problem for sure, and I hope one day you can add a "windows on close" or "on exit" trigger to construct2, it will saves a lot.