/sys$common/syshlp/helplib.hlb NCS Command, Parameter  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  input-file-spec[,...]

   Specifies an NCS file  in  the  NCS  library.  Typically,  the  file
   contains  the appropriate definitions  for implementing  a collating
   sequence or conversion function.  The default file extension is NCS.