A "folleto continuado" is when a company wishes to issue commercial paper over a period of time without having to file a new prospectus every single time. What they do is file a prospectus for the overall amount and get all the papers cleared. They then make use of the approval to issue securities as needed within the approved limits. It's called "shelf registration" because the papers are filed and just need to be taken down from the shelf and dusted off when needed.