1. A system for access to multimedia structures, the system comprising: telephone sets configured to connect to a telephone network; a storage device configured to store a plurality of multimedia structures representing at least one of messages, data and commands; a network access server that is associated with the telephone sets and is separate from the storage device and is comprises: a processor; and; memory storing at least one program that, when executed by the processor, causes the network access server to: receive a telephone call from one of the telephone sets; receive a number from the one telephone set after receiving the telephone call, wherein the number represents a remote hosting site in which the storage device is located; selectively instantiate the multimedia structures via an interconnection network by determining a network address of the remote hosting site using the received number; selectively instantiate the multimedia structures in a directory; download the multimedia structures contained in the directory; and instantiate a voice-recognition and speech-synthesis system that comprises modules for reading files in XML format, for associating these files with an XSL processing module, and for selectively mapping the XML files into the XSL processing module to obtain files in a format that is configured to be interpreted by the voice-recognition and speech-synthesis system.
7. The system defined in claim 1 wherein the multimedia structures comprise at least one element having an address for selectively instantiating further devices configured to store multimedia structures.