126.96.36.199.9.1 Processing Window Cloak State Change PDU
Upon receipt of the Windows Cloak State Change PDU (section 188.8.131.52.1), the server SHOULD cloak or uncloak the remote window whose ID is specified by WindowId as specified by the Cloaked field. The server SHOULD NOT send a Deleted Window Information Order as a result of processing this PDU. The server MUST NOT send a Window Cloak State Change PDU back to the client as a result of processing this PDU.
If no such window exists, the server SHOULD ignore the PDU.