// pairs are (module ID, FixedRateTimer)
static LPair<S, O> dm_listModulesAndTimers() {
  new LPair<S, O> out;
  for (S mod : dm_moduleIDs()) {
    Map map = cast dm_getOpt(mod, 'timers);
    L timers = filterByShortName FixedRateTimer(keys(map));
    fOr (O timer : timers)
      out.add(pair(mod, timer));
  }
  ret out;
}