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

    NCS$_DIAG          Operation completed with signaled diagnostics.
    NCS$_NOT_CS        Name of identifier does not refer to a
                       collating sequence.
    NCS$_NOT_FOUND     Name of identifier not found in the NCS
                       library.