I had a programmer who is an expert in NT7 and NT8 coding. He did it very fast, very accurate and very cheap. The total price for the complete rewriting costed me each switch less than $500. Each switch was done by him in less than three working days. I replaced the sensitive mathematical part in the original Easy Language code that I gave to him so that he did not know what my code was. After receiving the NT7, and later the NT8 version, I added myself the mathematical part with "trial and error". It took me weeks before it ran again error free. After that I checked if the results were identical to the Tradestation results.