Hello again, In a previous message I request your help, but I don't have been clear in my problem. Specifically, I'm trying to create an interface in R for the X-12-ARIMA and TRAMO SEATS, for the versions that run in MS-DOS. This problem awake in me the interest for make interfaces to comparing some Bayesian models for classification that where implemented in MS-DOS to. The question for you is if you know about the existence of an R function that allows me to run -in Windows- executable files in MS-DOS from the R command window. The function 'dos' in Matlab that I have mention in the previous message allows to run '.exe' programs for a specific directory. Many thanks. Saludos, Juan Carlos [[alternative HTML version deleted]]