The CREATE LIBRARY command builds CMS control files in a
    directory so that it can be used as a CMS library. After you have
    established a library with the CREATE LIBRARY command, you can
    issue CMS commands to manipulate the library. When you issue the
    CREATE LIBRARY command, your current CMS library is automatically
    set to the library or libraries specified. You can use CREATE
    LIBRARY only once on a library.

    You can create more than one library at a time by specifying the
    CREATE LIBRARY command with more than one directory specification.
    The directory specifications must be separated by commas.

    When you execute this command, CMS defines a logical name that
    begins with CMS$. These names are used by subsequent CMS commands.
    You should not define logical names beginning with CMS$ because
    this prefix is reserved for use by CMS.