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1.7 Versioning and Capability Negotiation

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The version of the Remote Desktop Protocol: Dynamic Channel Virtual Channel Extension is negotiated by a DVC client manager in response to a Capabilities PDU sent by a DVC server manager. The server indicates the maximum capability it supports, and the client responds with a Capabilities Response PDU that indicates the maximum capability that it can support.

There are three versions of the Remote Desktop Protocol: Dynamic Channel Virtual Channel Extension.

  • Version 1: The first version of the protocol consists of initialization, closing, and the sending of data over DVCs.

  • Version 2: The second version introduced the capability to specify priority classes for virtual channels in order to allocate different bandwidth to different classes of virtual channels.

  • Version 3: The third version introduced the ability to send and receive compressed data.

Implementations can support version 1, versions 1 and 2, or versions 1, 2, and 3 of the protocol. The negotiation of the protocol between the server and the client is described in section 2.2.1.