code: @Override
      public String listUsersHTML() {
          StringBuilder buf = new StringBuilder();
          buf.append("Format: username:pwd@dns-resolvable-domain<br/><ul>");
          for (String mUser : mUsers) {
              buf.append("<li>").append(mUser).append("</li>");
          }
          buf.append("</ul>");
          return buf.toString();
      }
docs: {@inheritDoc}