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I know that 3270 technology is more than a quarter of a century old. TN3270 I am sure is also old, but not as old. I am sure there are abundant documentaton, articles and samples of what you need. I have a book about TCP/IP over SNA, or something like that, but I have never used the book and I am not sure where it is at. I think you will get help in the IBM site if you have not already.