The asynchronous ECI call type with notification by message (ECI_ASYNC_NOTIFY_MSG) is available only for programs running on Windows.
The calling application regains control when the ECI accepts the request. This does not indicate that the program has started to run, it indicates that the parameters have been validated. The request might be queued for later processing.
The ECI sends a notification message to the specified window when the response is available. For information about the message format, see Reply message formats. When this notification has been received, the calling application should use ECI_GET_SPECIFIC_REPLY to receive the actual response; the ECI_GET_REPLY call type is no longer supported.
The following fields are required parameters for notification by message: