code: public boolean isAnyProcessInTreeAlive() {
      for (Integer pId : processTree.keySet()) {
        if (isAlive(pId.toString())) {
          return true;
        }
      }
      return false;
    }
docs: Is any of the subprocesses in the process-tree alive?
  
  @return true if any of the processes in the process-tree is
  alive, false otherwise.