session problem in struts 2 application

[sudhir pavan]

Have a session problem with application when opened in multiple tabs of a browser.
In my project a user can have multiple log in id's so he could log into the app with two id's
at the same time as two diferent users. but when they try to log in with two id in multiple
tabs of a browser. the same session of the browser is being shared and the data gets messed up.
Any insights to solve this issue?

if i logged in one account in one browser tab, then when i tried to login with another account id in another tab , then first logged in tab should be forwarded back to login page and current logged in tab should be active .
Any idea how this could be done...