SendStream is a read-only TStream property that represents the stream used for writing to the IOHandler data source when StreamType contains stWrite or stReadWrite. 

The stream instance in SendStream is assigned using the argument provided in Create. 

Use ReceiveStream to access the stream used for reading from the IOHandler. 

Use OnGetStream to create and/or update the streams used for the IOHandler. 

SendStream is freed in Close when FreeStreams contains True.