VMS Help CMS, SHOW, GENERATION, Qualifiers, /ANCESTORS  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Displays the transaction records of the specified element
    generation and all of its ancestors. The transaction records are
    listed in reverse chronological order. If you do not specify a
    particular generation, the list begins with the latest generation
    on the main line of descent.

    The ancestors of a main line generation are all the preceding
    generations back to the first generation of an element. The
    ancestors of a variant-line generation are all preceding
    generations on the variant line of descent, and any generations
    back to the first generation on the main line.