Authenticating Windows using Smartcard

Hello...
I am developing an application that uses smart card authentication. It is almost done but a big detail. How can I actually login the user instead of requesting him to enter his password?
I need to use smart card instead of password to authenticate. I have created a custom credential provider but I don't kinow which command to send it in order to log into the system using certain user (the one associated with the card)
Any help will be greatly appreciated
Thanks
Jaime
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Hi,
Which of either ( Windows 7 or 8) is better suited to be installed on Mac OS X. While carrying out the windows installation process if anything bad ( God forbid) happens will my Mac be safe to and can it be brought to back its original state. I desperately need windows but am skeptical about the installation process.
Can you confirm whether the steps mentioned in https://www.youtube.com/watch?v=3iMxPpb534U can be followed to install windows on Mac.
Thank you very much for all the help.

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