/sys$common/syshlp/helplib.hlb CMS, SHOW, GENERATION, Qualifiers, /GENERATION[=generation-expression]  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Specifies the generation about which you want information. When
    you use the /GENERATION qualifier with the element-name parameter,
    the transaction record of the indicated generation is displayed.