yp_bind_host
CLIENT *yp_bind_host(char *server, u_int program, u_int version,
ypserv = yp_bind_host(master, YPPROG, YPVERS, 0, 1);
client = yp_bind_host(host, YPPROG, YPVERS, 0, 1);
client = yp_bind_host(ipadd, atoi(prog), 1, atoi(port), 0);