Abstract: An information processing system architecture comprising a set of software products subdivided into domains (21-23), each of which comprises at least one software product. Each domain (21-23) contains specific information comprising an identifier of the domain (21-23), its attributes, and data on the software products comprising it. These data allow the installation and/or the updating of the domains (21-23) in accordance with a set of rules. The software products are constituted of products that are fully integrated into the domains, which follow standard installation and/or updating rules common to the system, and of heterogeneous products from external sources whose packaging and installation and/or updating rules remain specific. A consistency check of the version can be carried out on all or some of these external products. The system (2) comprises at least two specific domains for the operating system (21) and the operations monitor (23) of the system (2).