Four changes at https://msdn.microsoft.com/en-us/library/mt449537.aspx:
In Section 1.5, Prerequisites/Preconditions, clarified that the CHANNEL_FLAG_SHOW_PROTOCOL (0x00000010) has to be set in the flags field of the Channel PDU Header in order for it to be visible for all data that flows over the RAIL virtual channel.
In Section 4.3.2, TS_RAIL_ORDER_EXEC_RESULT, changed RAIL_ORDER_EXEC_RESULT to TS_RAIL_ORDER_EXEC_RESULT.
In Section 18.104.22.168.6, Processing Window Information Orders, clarified how the client will process the server window events of registration, deregistration, and updates on the edge of an application desktop toolbar.
Added two Window Information Orders to match the client behavior in Section 22.214.171.124.6, Constructing Window Information Orders, and removed two Notification Icon Orders to match the client behavior in Section 126.96.36.199.7, Constructing Notification Icon Orders.