The present invention relates to the definition of Digital Item as the unit of manipulation of multimedia data for electronic commerce activities such as creation, mining, transaction, transfer, management, storage, consumption, etc. The user’s activities are monitored on the communication network and associated with the pseudonym. The channels conform to one or more edges andor surfaces of the support and preferably one or more transverse ribs connect them together. Thus when the new lock is acquired all the corresponding memory locations of all computers have been updated. Large memory applications may access potentially unlimited network memory resources without requiring any application or operating system code modifications, relinkling or recompilation.