An event flow is executed when the server detects the corresponding event. For example, it is possible to configure the Failed Reply To Flow, Dead Letter Flow, and the Channel Failure Flow properties on a listener.

In unit testing mode, the debugger can launch these flows with a document supplied by the user. In configuration testing mode, the debugger can control the event flows executed by the server.

Event flows are deployed as system flows. Breakpoints and watchpoints can be set by first setting the source to the system flow, without the channel name.