ulPageId (ULONG)

      Page ID.

      Page identifier of the page whose window handle is requested.

    ulReserved (ULONG)

      Reserved value, should be 0.

    hwndPage (HWND)

      Window handle.

      Handle of the application page window associated with the specified page identifier.

      BOOKERR_INVALID_PARAMETERS

        An invalid page ID was specified for the ulPageId parameter.
      NULLHANDLE
        No application page window handle is associated for the page specified in the ulPageId parameter.
      Other
        Handle of the application page window associated with the specified page identifier.

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