in src/main/scala/com/gu/ssm/Interactive.scala [163:168]
def ready(instances: List[InstanceId], username: String, instancesToReport: List[InstanceId]): Unit = {
logger.trace("resolved instances and username, UI ready")
textGUI.removeWindow(textGUI.getActiveWindow)
textGUI.addWindow(mainWindow(instances, username, ResultsWithInstancesNotFound(Nil, instancesToReport)))
textGUI.updateScreen()
}