Abstract: Systems and methods are described that enable collaboration in interactive sessions. A first connection is established between a terminal client and a relay service and the terminal client engages in an interactive session with a terminal service. A second connection is established between a shadow client and the relay service and data and commands are relayed between the terminal client and the shadow client through the relay service, The first and second connections and the interactive session may be encrypted. The interactive session is encrypted using different encryption keys than the keys used by the first and second connections. The data and commands include information associated with the interactive session and the information may be used to synchronize displays between the terminal client and the shadow client.