https://doc.akka.io/japi/akka/2.5/akka/io/Tcp.CloseCommand.html
Tcp.CloseCommand
tcp
https://smartclient.com/smartgwt-latest/javadoc/com/smartgwt/client/widgets/drawing/CloseCommand.html
CloseCommand (Smart GWT LGPL Edition API 15.0d (2026-05-09))
declaration: package: com.smartgwt.client.widgets.drawing, class: CloseCommand
smartgwtlgpledition