how do avoid multiple login of users from different browser..?

i mean first i logged in from IE
next i logged in from Mozilla..

now if i'm once logged in ..
i want to show user a message
that u r already logged in

i'm using membership framework..

any help..?

well i created my login system and i manage it myself. on that part every time a user logs in i change the status in the profile in the database as online, and if another user tries to log in with a username that is online, i will just display a message that the user is currently logged in in another place. but if you go this route , you need to make sure that when the user idle you log the user out or if the user uses the closes button of the browser you need to check that and change the status appropriately.

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