winlogon and msgina.dll

I'm searching for any information about msgina.dll. How can I write own gina.dll and debug it. I want use chip card reader.

Thanks

On the MSDN-CD there is a quite good sample for writing a own gina.dll and
a documentation of the howto.

I used that as a point to start writing my own gina some time ago. But be sure to
use the FAT-System on the debugging-machine and have a working-dummy-gina
ready if your new dll is buggy...

bye

Maximilian