How win7 logon through voice recognition impliment by credential provider?

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Vista

C++

Win7

I Impliment Credential Provider dicover that microsoft supply combox ,editText,
submitbutton,no control an interface for voice recognition logon.
i want to my voice logon module can logon the system,but not input password
not authentication password by AD sever.my voice module is a Credential Trust by
windwos system.another problem is that I do not want my system enter into deskshop
directly when voice module do no work,so when voice module do not work,password
credentail must work,please give me a idea how to do it.

What I have tried:

credential provider i have impliment, but voice recognition do not ,voice moudle
interface other people offer!