+extern void send_key_changed_all(void);
+extern int send_del_host(conn_list_t *, conn_list_t *);
+extern int send_tcppacket(conn_list_t *, void *, int);
+extern int notify_others(conn_list_t *, conn_list_t *, int (*function)(conn_list_t*, conn_list_t*));