3.2.5.1 Sending an RDPINPUT_SC_READY_PDU Message
The structure and fields of the RDPINPUT_SC_READY_PDU message are specified in section 2.2.3.1.
If the server does not support touch injection, then it MUST NOT send this PDU to the client. The protocolVersion field SHOULD be set to at least RDPINPUT_PROTOCOL_V200 (0x00020000) if the server supports the injection of pen input using the RDPINPUT_PEN_EVENT_PDU (section 2.2.3.7) message.