+/** \ingroup msg_simulation
+ * \brief set a configuration variable
+ *
+ * Do --help on any simgrid binary to see the list of currently existing configuration variables, and see Section @ref options.
+ *
+ * Example:
+ * MSG_config("host/model","ptask_L07");
+ */
+void MSG_config(const char *key, const char *value){
+ xbt_assert(msg_global,"ERROR: Please call MSG_init() before using MSG_config()");
+ xbt_cfg_set_as_string(_sg_cfg_set, key, value);
+}
+
+