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what is single sign on implimentation? please tell me? what we can do with that?

Best Answer chosen by Admin (Salesforce Developers) 

With single sign on a user can use a single login credentials to log into the other trusted web resources/website between  organization and other websites (with the use of external identity management system). You don't have to remember multiple passwords.

More @ http://wiki.developerforce.com/page/How_to_Implement_Single_Sign-On_with_Salesforce.com