VMS Help CMS, SET, NOLIBRARY, Command Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 directory-specification

    Specifies one or more existing CMS libraries in the current
    library search list. The directory specification must conform
    to VMS conventions; it can also be a logical name which translates
    to a search list. If you specify more than one VMS directory, you
    must separate the directory specifications with commas. Wildcards
    are not allowed.  If you do not supply a directory specification,
    CMS removes all libraries from the current library search list.