hwnd (HWND)

      Window handle of the sender.

    pDdeStruct (PDDESTRUCT)

      DDE structure.

      This points to a dynamic data exchange structure. See DDESTRUCT.

      Flags in the fsStatus field are set as follows:

      DDE_FACKREQ

        If this bit is 1, the receiving (client) application is expected to send a WM_DDE_ACK message after the memory object has been processed. If it is 0, the client application should not send a WM_DDE_ACK message.
      DDE_FRESPONSE
        If this bit is 1, this data is offered in response to a WM_DDE_REQUEST message. If it is 0, this data is offered in response to a WM_DDE_ADVISE message.
      offszItemName identifies which data item is available.

      offabData is the data. The format of the data is a registered DDE data format, identified by the usFormat field.

    ulReserved (ULONG)

      Reserved value, should be 0.

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