3.1.5.1 Sending the RDP_PRECONNECTION_PDU_V1

The client MUST initialize the cbSize field with the total size, in bytes, of the PDU. The size of RDP_PRECONNECTION_PDU_V1 is always 16 bytes.

The client MUST initialize the version field with the RDP_PRECONNECTION_PDU_V1 value.

The Id field SHOULD<1> be set to the RDP source ID for which the connection is intended. The value of this field can be determined by the client, either by convention or by communicating with the server.