docs: function setupClients(clientList, mixinConf) {
      var i, len, cache;
  
      cache = {};
  
      // Resolve special values of clientList.
      if ('string' === typeof clientList) {
          switch (clientList) {
          case 'all':
              clientList = this.clients.id.getAllKeys();
              break;
  
          case 'players':
              clientList = this.clients.player.id.getAllKeys();
              break;
  
          case 'admins':
              clientList = this.clients.admin.id.getAllKeys();
              break;
          }
      }
  
      // Setup all given clients.
      i = -1, len = clientList.length;
      for ( ; ++i < len ; ) {
          this.setupClient(clientList[i], mixinConf, cache);
      }
  }