void fgAddToWindowDestroyList ( SFG_Window* window );
void fgCloseWindows ();
void fgDestroyWindow( SFG_Window* window );
-void fgClearCallBacks( SFG_Window *window );
/* Menu creation and destruction. Defined in freeglut_structure.c */
SFG_Menu* fgCreateMenu( FGCBMenu menuCallback );