Hi, Vikram and I are beginning work on a native R package to interface into X-12-arima. We have looked through gretl, and previous discussions on kludgy interfaces involving calls to the x12a binary. Our aim is to port as much of the functionality as possible with native R objects, and to do away with the archaic file-based interface of X-12-arima. Our estimate is that some X-12-arima Fortran source will need modification as well, to separate its I/O. We would appreciate any pointers or existing code that could help us. If anyone is already working on something similar, we would be happy to pool effort. Neha <neha.pandey at gmail.com> Vikram <vikram at mayin.org> -- Neha Pandey: neha.pandey at gmail.com.