This class/message type is preferably used to indicate failure of some operation performed.
This class/message type is preferably used to indicate failure of some operation performed. As an example, it is used to signal failure with AskSupport is used (ask/?).
This class/message type is preferably used to indicate success of some operation performed.
This class/message type is preferably used to indicate success of some operation performed.
Classes for passing status back to the sender. Used for internal ACKing protocol. But exposed as utility class for user-specific ACKing protocols as well.