How to check status of an client account?

Question

sir
i have created a desktop application. which contains database of mysql...
also contains a login panel as a user get login the status of that user changes to  true... if a user logout than status changes to false...
Now question is that... how can i check the user status as session in web application..
i want to logout user automatically if user is not active on my application according to limited timing like after 10 minutes server automatically logout.