Displays the transaction records of the specified element
    generation and of all its descendants. The transaction records
    are listed in reverse chronological order. If you do not specify a
    particular generation, the list begins with generation 1.

    The descendants of a generation consist of all the successor
    generations, including those that on variant lines of descent.
    Thus, you can use this command to determine whether any variant
    lines of descent exist for a particular element.