/*static class Presence {
  long room;
  S name;
  int n;
}*/

static L<S> getWebChatPresences(long room) {
  Map data = jsonDecodeMap(loadPageSilently("tinybrain.de:8080/tb-int/groupchat.json.presences.php?room=" + room));
  L<Map<S, S>> lines = (L) data.get("presences");
  new L<S> names;
  for (Map<S, S> m : lines)
    names.add(m.get("name"));
  ret names;
}