I do not work for IBI. I have not had any experience with a mainframe but my environment seems to be similar. I have my web server on one NT box. I have my webfocus server on another NT box. I am accessing oracle data that is on HP and IBM servers (unix). All that you need to do is load webfocus on the NT server. However, follow the instructions for 3-tier installation. Also, IBI should be able to help you. Just call your local sales office...