The videotex processable data facility specified in this document is intended to be used for data file transfer. These files may contain computer software or other file types. This protocol may be used to download file frem the host to the terminal. It may also be' used for transfering files between two end systems in both directions@ all the operations being then performed under the.control of one or the other system depending on a preliminary negociation. It has been defined to work in a videotex environment but it may also work without specific application environment.