VMS Help RTL Routines, LIB$, LIB$GET_LOGICAL, Condition Values Returned  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    SS$_NORMAL         Routine successfully completed.
    SS$_ACCVIO         Access violation. Cannot access the location
                       specified.
    SS$_BADPARAM       Bad parameter value.
    SS$_IVLOGNAM       Invalid logical name. The logical name or its
                       value contained more than 255 characters.
    SS$_IVLOGTAB       Invalid logical name table.
    SS$_NOLOGNAM       The logical name was not found in the
                       specified table.
    SS$_NOPRIV         No privileges for attempted operation.
    SS$_TOOMANYNAM     Logical name translation exceeded allowed
                       depth.
    LIB$_INVARG        Required argument is missing.
    LIB$_INSVIRMEM     Insufficient virtual memory.
    LIB$_INVSTRDES     Invalid string descriptor.
    LIB$_STRTRU        Success, but source string truncated.
    LIB$_WRONUMARG     Wrong number of arguments.