VMS Help CMS, CREATE, ELEMENT, Qualifiers, /HISTORY="string"  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Establishes the history attribute for the element. If an element
    has the history attribute, its history is included in the file
    when you retrieve it with the FETCH or RESERVE command.

    The quoted string specifies the format of the history. The quoted
    string must contain the characters #H or #B (lowercase is allowed)
    and can contain other printing characters. To include a quotation
    mark in the output history string, type it twice (""). To include
    a number sign (#) in the output history string, type it twice
    (##).