-int connection_send_apdu(struct connection *co, Z_APDU *a);
-struct host *connection_get_host(struct connection *con);
-void connection_set_authentication(struct connection *co, char *auth);
-int connection_connect(struct connection *con);
-struct connection *connection_get_available(struct connection *con_list,
- struct session *se);
-int connection_prep_connection(struct connection *co, struct session *se);