The method involves connecting a removable flash memory to a local unit (UL), where the removable unit comprises a management application of digital data (2). An automatic management application is performed. Authentication of the management application is performed by an authentication unit. The digital data is transmitted from the local unit to remote units (US1, USN). The transmitted digital data is selected by a user. An automatic transmission of digital data is transmitted between the local unit and the remote units via the management application. An independent claim is also included for a system for comprising a removable unit for transmitting digital data between a local unit and a remote unit.