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How to modify the gnome login screen function (by code)

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http://ubuntuforums.org – Dear all, I'm a programmer in Linux environment. I just have a requirement that requires me to build a new login function for Ubuntu 12.10 (quantal) The requirement is: - Supporting the Ubuntu users outside company (more than 1000 PCs worldwide) could be authenticated with our system through their username/password. I have a system that run as web-services and allow users giving input of their username/password then we will return yes if trust and no in other cases. - The Ubuntu user after that could login the system by their account from our company. The problem here: - We can't use the (Hardware)