I am using Tomcat 7.0.11 and use Form Authentication (via j_security_check) to 
authenticate through the Tomcat server.
Currently, two users with the same username can log into my application from 
two different computers and concurrently access the app.
Is there a way to prohibit a user from authenticating if a user with the same 
username has previously authenticated and still has an active session?

Thanks
Beau

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