ulReserved (ULONG)

      Reserved value, should be 0.

    ulReserved (ULONG)

      Reserved value, should be 0.

    rc (BOOL)

      Changed indicator.

      TRUE

        The text in the entry field control has been changed since the last time it received this message or a WM_QUERYWINDOWPARAMS message.
      FALSE
        All other situations.

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