Sorry, in the last mail I forgot to post the link to the paper that shows how the software was implemented.
The name of the paper is: “Modelos SARFIMA diarios no estacionarios: aplicación al consumo de energía eléctrica”... Something like "Non stationary daily SARFIMA models. Application on the uruguayan electricity consumption"
This paper was presented at the Economic lectures in the Uruguayan Central Bank last August.
You can download the paper (in spanish) from: http://www.bcu.gub.uy/autoriza/peiees/jor/2008/iees03j3250808.pdf
 
Sorry!