Validates the PFN database contents for each attached PFN. The
    default is all lists (free, bad, untested) plus the PFN database
    pages and the complete range of PFNs in the CPP.

    You can limit which lists are validated by specifying one or
    more keywords from the following table. If you specify multiple
    keywords, enclose them in parentheses and separate keywords with
    a comma.

    ALL_FRAGMENTS   Validates the complete range of PFNs in the CPP.
    BAD             Validates only the bad page list.
    FREE            Validates only the free page list.
    PFNDB           Validates the PFNs containing the PFN database.
    UNTESTED        Validates only the untested page list.

    If you specify the /PFN without /ALL, /IDENT, or /ADDRESS, the
    system validates the PFN lists from the last shared memory CPP.