hwndParent (HWND) - input

      Parent-window handle.

    ulMsgId (ULONG) - input

      Message identifier.

    mpParam1 (MPARAM) - input

      Parameter 1.

    mpParam2 (MPARAM) - input

      Parameter 2.

    flCmd (ULONG) - input

      Broadcast message command.

      BMSG_POST

        Post the message. This value is mutually exclusive with BMSG_SEND and BMSG_POSTQUEUE.
      BMSG_SEND
        Send the message. This value is mutually exclusive with BMSG_POST and BMSG_POSTQUEUE.
      BMSG_POSTQUEUE
        Post a message to all threads that have a message queue. This value is mutually exclusive with BMSG_POST and BMSG_SEND. The hwnd parameter of the QMSG structure is set to NULL.
      BMSG_DESCENDANTS
        Broadcast the message to all the descendants of the hwndParent parameter.
      BMSG_FRAMEONLY
        Broadcast the message only to windows with a style of CS_FRAME.

      rc (BOOL) - returns

        Success indicator.

        TRUE

          Message was sent or posted successfully to all applicable windows
        FALSE
          Error occurred.

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