hwnd (HWND)

      Window handle of the sender.

    pDdeStruct (PDDESTRUCT)

      DDE structure.

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

      offszItemName identifies the data item to the receiving application.

      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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