Knowledgebase
How to check the customers currently online in Magento
The admin panel of your Magento has a feature that allows you to view the customers who are currently online. To do this go to Customers menu>Online Customers. On the page that opens you'll see a table with the online customers. It shows the name and email address of the customer, the IP address used to access your site, the session start time, etc. If you click on the row of the table that displays this information, you'll be redirected to the account settings of the customer. The table also lists the guests who are browsing the frontend of your site.
By default, this list is refreshed every fifteen minutes. You can change that interval. To do this go to System menu>Configuration>Customer Configuration button in the Customers section on the left>Online Customers Options panel on the right. In the field for Online Minutes Interval type the number that you want (it's set in minutes).