The HL7 Listener is a utility which functions like a simple HL7 server. It is designed to make it easy to listen and record a stream of messages from an HL7 server. It is a single form application which comes free with Iguana, and can be accessed from the iNTERFACEWARE programs menu.

The most powerful feature of the listener is that the log file can be replayed through the HL7 Simulator tool to recreate the original HL7 feed for development and testing.