Dear Prof. or Dr. After installation(modeller v8.1),I use this command:mod8v1 __spline.top(or other .top files),I get answer:mod8v1[43]:ulimit:exceeds allowable limit. I think the installation of modeller is easier than other softwares,however,I failed. So,I'm very expecting your reply. zhurx@mail.sioc.ac.cn 2005-09-26