Unlock Windows desktop

[g33man]

I am searching for a method to unlock a Windows desktop, assuming I already have the credentials.

Background:
I have a gadget called a Wireless USB PC-Lock. It is a proximity device that locks my PC when I walk away, and unlocks it when I return. The included software is WEAK! It doesn't really lock/unlock the desktop, just simulates it with an easily breakable driver. I want to write my own driver that truely locks/unlocks the desktop using the Windows API- I'm currently on Vista. Locking the desktop is easy. Some Googling indicates that unlocking it cannot be done. I am not giving up, however. I have a Lenovo tablet with the fingerprint reader. I previously registered my Windows credentials with the fingerprint utility, and now can unlock my tablet with just a finger swipe. If the fingerprint utility can do this programmically, there is obviously a way.

Suggestions are welcome, thanks.

 

[strongm]

>there is obviously a way.

Yes, you can write your own GINA (google it). However, writing a GINA in VB is ...um ... non-trivial ...

 

[g33man]

GINA in VB6? Sounds easy enough... -KIDDING!!! ;-)

It didn't occur to me that there was a separate GINA providing the fingerprint reader functionality, but now that you've said it, it makes sense. Crap.

Thanks for your reply.

 

[g33man]

Just some more detail for any future readers of this thread. The GINA was last used in WinXP. Newer Windows versions now use a concept called Credential Providers. To do what I had originally asked, means writing my own Credential Provider to detect the wireless device, then feed in the pre-stored login credentials. This is well documented at MSDN. At this point, I can only find sample code written in C. Realistically, I don't think I will get this project done - it is a way bigger effort than I had hoped.