How to allow only single login to a web application

Hi,

My web app is based on struts. My question is as follows

I have logged in using my username and password and again i have accessed the application in another tab or in another browser in the same system. at that time it should not ask the user to login again. It has to display the page of the previous user.

Fopr example, take gmail. If i am logged in with a username and password and again if i am accessing the gmail in another tab, it will open the logged in page of the user. so that i have to logout first and then only i have to login with whatever teh username and password might be

Hope you understand. please let me know if you need any further info in this regard.

CIPL-SenthilAsked:
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Loganathan NatarajanConnect With a Mentor LAMP DeveloperCommented:
You need to use SESSION to handle for single user auth ... If you have session on the another tab page, then you can handle it.

Normally, all the web application have like this idea?

didn't you use SESSION?
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CIPL-SenthilAuthor Commented:
Thank you


But already we are knowing this.  But We want to know any other possibility exists for this

Any ore suggestions...
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sprisonerCommented:
If you are using a database, whenever user logs in, store the logged time and a flag as true in database. Let every page check this value and if user has logged in recently, you can skip the login part.

Here, you need to login time, because you do not want the user flag to be true always. So check the flag as well as time (for eg. has the user logged in and in last 20 mins?), then no check, else ask to relogin.
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