When all the messages have been sent, examine the Dashboard. The Errors column should remain blank, and the Last Activity column should have been updated for each channel:

Next, open the message.txt output file you specified in the Destination: To File component of Channel 3. You should see the messages that were sent by Channel 1 and then routed to Channels 2 and 3:

You can also examine the Iguana logs to see the flow of messages through your configuration. To do this, from Iguana, click the Logs tab:

Here, you can track the progress of each message. The tutorial channel accepts the message and places it in a queue. The tutorial2 channel then sends the message through port 8889 to the HL7 Listener, and the tutorial3 channel appends the message to the file that you specified.