1.5 Prerequisites/Preconditions

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The Remote Desktop Protocol: Multiparty Virtual Channel Extension operates only after a static virtual channel transport, as specified in [MS-RDPBCGR] section 3.1.5.2, with the name "encomsp" (encoded as a string of ANSI characters) is fully established. If the static virtual channel transport is terminated, no other communication over the Remote Desktop Protocol: Multiparty Virtual Channel Extension occurs.

The client sends a pre-connection PDU prior to establishing a Remote Desktop Protocol (RDP) connection, as specified in [MS-RDPEPS] section 2.2.1.