Tomcats session architecture

Hi all

As everyone knows that IE issues same session Id to the browsers opened through Ctrl-N /going to File --New -->window .

I have a webapplication which has concept of web licensing ...mean to say only 10 clients can operate .......this is done using sesision mech in tomcat ....now the user will be misusing that by using these ways

so how can i avoid this ?? i know that Ctrl-N can be trapped through javascript but not the other option ..........i dont mind even if the effort will be more ........can i think of overwriting tomcats session architecture so that it issues a new session for the Ctrl-N window

I need a complete solution for this ? can any one help me out in this regard

Regards
Sreenath