code: @SuppressWarnings("unchecked")
      @Override
      public Boolean execute() {
          validateCommand();
          List<User> users = new ArrayList<>();
          for(String username : usernames) {
              User sfsUser = CommandUtil.getSfsUser(username, api);
              if(sfsUser != null) users.add(sfsUser);
          }
          ISFSObject params = createResponseParams();
          extension.send(command, params, users, useUDP);
          logResponse(params);
          return Boolean.TRUE;
      }
docs: /* (non-Javadoc)
  @see com.lagente.core.command.BaseCommand#execute()