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1. how can i hide the login in the url.    coderanch.com

2. Single login for a Particular url    coderanch.com

Hi All, I'm required to restrict a user from signing into the same URL second time. i.e., when a user A has logged in to the application with user name "A",he can not log in with other user name with in the same browser. I had an idea like, on load of the login page i will check for the session, ...