/sys$common/syshlp/SDA.HLB  —  SHOW  PFN_DATA, Qualifiers  /ADDRESS
       /ADDRESS=PFN-entry-address

    Displays the PFN database entry at the address specified. The
    address specified is rounded to the nearest entry address, so
    if you have an address that points to one of the fields of the
    entry, the correct database entry will still be found.
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