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

       /MAINTENANCE=(product-name[,...])

    Displays the products to which the named maintenance products
    have been applied. A maintenance product is either a patch kit or
    a mandatory update kit.

    Parentheses (())  are optional only when you specify a single
    product name. They are required when you specify multiple product
    names.

    To list all maintenance products that have been applied to a
    particular product, use the following command:

    PRODUCT SHOW PRODUCT product-name /FULL