protected void help(List args) {
    String topic = "overview";
    if (args.size() > 0) {
      topic = (String) args.get(0);
      if (!Arrays.asList(helpTopics).contains(topic.toLowerCase())) {
        System.err.println(
            String.format("ERROR: Invalid help topic %s.", topic));
        usage();
      }
    }
    PrintWriter pw = new PrintWriter(System.out);
    printHelpTopic(topic, pw);
    pw.flush();
    if (args.size() == 0) {
      usage("help");
    }
  }
Represents a list of ResourceInst that have been combined together. Note the most common case
is for this class to only own a single ResourceInst.
geode-core/src/main/java/org/apache/geode/internal/SystemAdmin.java