Data transmission network for e.g. medical insurance establishment, has administrative computer that is connected to memory and accessed to identification and data files but not to data identification link code

摘要

The network has a memory (1) with an identification file (2) and a data file (3), where the files have a set of layers. Each layer of the identification file is linked by a data identification link code to corresponding layers of the data file. An administrative computer (G) is connected to the memory and has access to the identification and data files but not to the data identification link code.