Integration Service and session type.
Choose the Integration Service to run the session. You can also choose to run the Debugger against an existing non-reusable session, an existing reusable session, or create a debug session instance. When you run the Debugger against an existing session, the Integration Service runs the session in debug mode. When you create a debug session, you configure a subset of session properties within the Debugger Wizard, such as source and target location.