Synopsis

gboolean            mex_is_online                       (void);
void                (*MexOnlineNotify)                  (gboolean online,
                                                         gpointer user_data);
void                mex_online_add_notify               (MexOnlineNotify callback,
                                                         gpointer user_data);
void                mex_online_remove_notify            (MexOnlineNotify callback,
                                                         gpointer user_data);