+\section GRAS_tut_tour_globals_toc Table of Contents
+ - \ref GRAS_tut_tour_globals_intro
+ - \ref GRAS_tut_tour_globals_use
+ - \ref GRAS_tut_tour_callback_pitfall
+ - \ref GRAS_tut_tour_callback_recap
+
+<hr>
+
+\section GRAS_tut_tour_globals_intro Introduction
+