code: function (account, data, conn) {
  
  	//if (l_logins.hasOwnProperty(account) === true)
  		//return false;
  	
  	// check if user's unique data exists
  	if (typeof data.data !== 'object') {
  		LOG.error('data field does not exist, cannot add login data');
  		return false;
  	}
  	
  	LOG.warn('account: ' + account + ' data:', 'addLogin');
  	LOG.warn(data);
  	
  	// attach login name to connection
  	// NOTE: we attach connection object to the data stored in memory (not clean?)
  	if (conn) {
  		// NOTE: we use session because this request could come from an HTTP request
  		// that does not have a persistent connectino record in SR.Conn
  		SR.Conn.setSessionName(conn, account);
  		data._conn = conn;
  	}
  	
  	l_logins[account] = data;
  	LOG.warn('user [' + account + '] login success, total count: ' + Object.keys(l_logins).length, 'user');
  
  	delete data._conn;
  	//console.log(data);
  	
  	// error check: make sure lastStatus field exists
  	if (data.hasOwnProperty('lastStatus') === false || data.lastStatus === null) 
  		data.lastStatus = {loginCount: 0};
  	
  	data.lastStatus.loginIP = conn.host;
  	data.lastStatus.loginCount = data.lastStatus.loginCount + 1;
  	data.lastStatus.time = conn.time;
  
  	SR.DB.updateData(SR.Settings.DB_NAME_ACCOUNT, {account: account}, data,
  					 	function () {
  					 	},
  					 	function () {
  					 	});	
  
  	return true;
  }
docs: store & remove user data to cache