The repository files are generally arranged in a single directory hierarchy. The highest-level directory contains one file artbase.roo that contains the names and paths of all the repositories, and a subdirectory containing each of these repositories. Initially there is probably only one repository, but later you may make backup or checkpoint repositories, copies of your main repository made at a certain time.

In a repository directory there are two files, manager.ab and trid. The manager.ab file contains the names and paths of all the areas in that repository, the names and encoded passwords of all the users in that repository and any disk name mappings needed to access the repository. The repository directory also contains several subdirectories: