title: Change the authentication type in Liferay portal 6
body: <p>I am new to Liferay portal.We have planned to use the version 6.As you know current we can login to Liferay with any of emailAddress,screenName,userId.</p>
  
  <p>1.Our existing Jboss portal is using Customer ID as the user name.So we don't want to change this for liferay portal also.How to include Customer ID as one of the authentication type?</p>
  
  <p>2.In current Liferay portal we can use any one of emailAddress,screenName,userId as the 
  user name.Is it possible to use the combination say emailAddress and screenName and password ?</p>
  
  <p>Thanks in Advance.
  Any help is appreciated.</p>