- AUX
  - Short for "disk AUXiliary" this stores the default directories for reading and writing files.
  - There are three main components to the AUX:
    AUX List
      The list of directories that can be used in either the Read AUX or the Write AUX. Each entry is stored as `<ID>=<PATH>` and can subsequently be referred to by ID.
    Read AUX
      The list of ID's (in order) to search when trying to read a file.
    Write AUX
      The ID of the path to the default output directory.
  - The use of the AUX allows applications to be written in a disk-configuration-independent manner. Each site can just alter their AUX entries as needed to match their local configuration.