Is it possible to mass update users licenses in Salesforce?

Is it possible to mass update users licenses in Salesforce

It can possible mass update users licences in salesforce with Data loader or On-Demand Tools.To simply update the User ProfileID. When you mass update users ProfileID the underlying User License gets updated.

Please refer user object details

http://www.salesforce.com/us/developer/docs/api/Content/sforce_api_objects_user.htm

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