How to block parallel login?

[Anisuzzaman]

How to block parallel login?

How can I block multiple login attempts in to a single account, when that user have already logged in?

Like... Yahoo/Hotmail email accounts...

1. When I logged in, using <username: russell> & <password: 123> from <my pc: xunit>

2. Until I logout or close my browser, the system should not allow me to login again from <my pc: xunit> or from any other pc, using same <username> and <password>.

How can I solve my problem? Please help…

[redhead]

Set a timer, have a date("U") stamp set in the user profile, and say if no cookie containing the user-login info exist, but the date stamp is say no more than 5 minuts old, you're probably trying to login from several locations at the same time.
And have a check to say, if stamp is more than 5 minuts from now, but user is loged in, update to now.
Then uppon logout, set timestamp to somethign like 10 minuts in the past.