I have created Login module for my J2EE Web Application. It prohibits the multiple login. It means that if you have been logged in to the system from PC 1, you can log in from PC 2 but with warning. If you log in from PC 2, the session is granted to you and the PC 1 session is invalidated. it works well :).
Now, my problem is this....
I simulate the situation in one PC. I open two browsers. It works perfect, only one browser can connect to my system. However, problem comes if after I log in, I choose File->New in IE. It seems that the session is duplicated and both valid.