Hello folks, this is my first post and relatively new to PHP also. I am facing some real session issues. Will explain in detail: I have a main webpage that opens up in a new browser window. The webpage has several frames that opens up different .php files. The frames refresh after every fix duration. So the main page never refreshes completely. I have a session set on it. All is fine. Now when a user logs in with the same username and password on machine 2 as machine 1 the user on machine 1 should not be able to browse further. His session should expire. Something that you so often see on yahoo mail site. Got my point?? Do leme know if you need anyother information. The site is hosted on Linux 9 and Mysql is the database. Any help will be appreciated. Thx in advance. Cheers!!