3.3.5.2.11.1 Sending Taskbar Tab Info PDU

The server SHOULD send the Taskbar Tab Info PDU (section 2.2.2.14.1) whenever it determines that the state of a tabbed application’s taskbar tab group has changed. However, the server SHOULD NOT send the PDU if it does not support tabbed applications, or if the client has not advertised support for extended shell integration in the Remote Programs Capability Set (section 2.2.1.1.1).

If the client has connected to an existing session, the server SHOULD re-sync the taskbar tab state of its tabbed applications to the client by sending RAIL_TASKBAR_MSG_TAB_REGISTER, RAIL_TASKBAR_MSG_TAB_ORDER, and RAIL_TASKBAR_MSG_TAB_PROPERTIES messages for each window in each tabbed application in the session.