Je savais pas. Un nexus, c'est :

To briefly reiterate, an integration nexus is a commons which different applications on the same system can use to interoperate. A filesystem is a canonical example of an integration nexus, because it allows applications to consume files generated by other applications, without even necessarily knowing or caring what application generated the file. A maintenance nexus provides an operator with access to the various resources in a system so that they can operate on them. The Unix filesystem is both an integration nexus and a maintenance nexus. Unix sysadmins ssh into machines to administer them, and by and large the shell they are immediately given lets them work with the filesystem and the files on it.