VMS Help DSR, DSR Commands, .INDEX  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    The .INDEX command creates an index entry with a page number
    reference.

    Format

      .INDEX  topic [>subtopic1... >subtopicn]

    Abreviated format

      .X  topic [>subtopic1... >subtopicn]