1.5 Prerequisites/Preconditions
The Remote Desktop Protocol: Display Control Virtual Channel Extension operates only after the dynamic virtual channel transport is fully established. If the dynamic virtual channel transport is terminated, the Remote Desktop Protocol: Display Control Virtual Channel Extension is also terminated. The protocol is terminated by closing the underlying virtual channel. For details about closing the dynamic virtual channel, refer to [MS-RDPEDYC] section 3.2.5.2.
If the RemoteFX codec ([MS-RDPRFX] sections 2.2.2 and 3.1.8) is being used to encode graphics data from a remote session, then the Remote Desktop Protocol: Display Control Virtual Channel Extension SHOULD NOT be used to request display configuration changes.