An IBM Traveler server is an IBM Domino server with Traveler installed on it. VitalSigns can automatically detect which Domino servers are running Traveler and perform most Traveler-specific tests against it without additional configuration. However, some tests (such as testing the servlet) require additional information and credentials beyond what is required for an ordinary Domino server.
IBM Traveler servers are presented on the Traveler Health page and also the servers will get an extra tab when viewed in the Dashboard.