- The `AUX` Command:
  - The `AUXILIARY` command (almost always shortened to `AUX`) is used to set the default read and write directories.
  - The `AUX` command takes in two arguments: `<write>` and `<read>`

        nM> AUX <write> <read>

    Where `<read>` is a bar-separated list of AUXs to read from. For example:

        nM> AUX HOME HOME|DAT|CWD

  - If given no arguments, the current set of AUXs is listed.

        nM> aux
        Write AUX     = 1
        Read AUX List = 1|CWD|DAT|99|RAM

        CWD      = /home/student/nxm230/                    <Type=File>
        HOME     = /home/student/                           <Type=File>
        HOMEPATH = /home/student/                           <Type=File>
        DAT      = /home/student/nxm230/nxm/sys/dat/        <Type=File>
        RAM      = ram:                                     <Type=Ram>
        1        = /midas/data1/+/                          <Type=File>
        99       = /midas/opt/xmxxx/xm/dat/                 <Type=File>
        WEB      = http://nextmidas.com/nm/nxm/sys/dat/     <Type=Http>

  - It is common to include the write AUX as an entry in the read AUX and this is recommended.
  - Since the most common use of `AUX` is to make minor changes to the read AUX, there are a number of short-hand ways to set/modify the read AUX:
    - Specifying the entire list:

          nM> AUX ,, myaux|dat|cwd

    - Adding one to the list:

          nM> AUX ,, +myaux

    - Removing one from the list:

          nM> AUX ,, -myaux

    - See the `AUX` explain file for more details.
  - Important Note For Windows Users: There are a few special issues about setting AUXs on Windows. Most of the issues relate to drive letters and network-mapped drives. Please see the `AUX` explain file for more details.