title: how to avoid multi login from same browser in liferay?
body: <p>i am using liferay 6.1 and created my custom portlet
  am using liferay login portlet and in that i have some problem while login with the following step..</p>
  
  <ul>
  <li>login with user1 </li>
  <li>now open diffrent tab with same url which will automatically login to user1 account in liferay</li>
  <li>now logout from any of tab and then u will logout from both the tab</li>
  <li>now from two tab first login with user1 in tab1</li>
  <li>now do login with user2 from tab2</li>
  </ul>
  
  <p>Now liferay will login with me two diifrent user in same borwser with diffrent tab.(when i refresh the page it will login automcatically with the last user login account)
  Now what i want is when same user try to login with same browser it will automcatically redirect to user account which login first in tab..</p>
  
  <p>can any body gudide me how to do that??</p>
  
  <p>I have tried with some change in portlet-ext.properties file as follows but didnt succeded</p>
  
  <pre><code>live.users.enabled=true
  #
  # Set the following to true if users are allowed to have simultaneous logins
  # from different sessions. This property is not used unless the property
  # "live.users.enabled" is set to true.
  #
  auth.simultaneous.logins=false 
  </code></pre>