First, introduce me. Our computer is DECstation 5000/25. and use UTRIX. The reason why I tell this story is the way you teach doesn't act in this computer. Have you another way? If you have it, tell me. Recently I was too busy and for the long time I can't connect with the kids. I'm sorry for the late answer. Please help me much. NOT ONLY HWANGHYON AND BUT ALSO EVERYONE WHO CAN HELP.