3.1.5 Processing Events and Sequencing Rules
The client MUST send either the RDP_PRECONNECTION_PDU_V1 or RDP_PRECONNECTION_PDU_V2 to the server before sending any of the PDUs described in the [MS-RDPBCGR] specification.
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The client MUST send either the RDP_PRECONNECTION_PDU_V1 or RDP_PRECONNECTION_PDU_V2 to the server before sending any of the PDUs described in the [MS-RDPBCGR] specification.