There is a bunch of undocumented parameters at: http://developer.gnome.org/doc/API/2.0/gtk/GtkNotebook.html#GtkNotebook-select-page In the following, I guess arg1 is the index of the page? I'm just guessing, but it would be nice if they were documented properly. Thanks. And BTW what is the name of the program used to generate the documentation from sources. Is doxygen being used or some other program? Thanks, Neil Signals The "change-current-page" signal void user_function (GtkNotebook *notebook, gint arg1, gpointer user_data); notebook : the object which received the signal. arg1 : user_data : user data set when the signal handler was connected. _______________________________________________ gtk-list@xxxxxxxxx http://mail.gnome.org/mailman/listinfo/gtk-list