So, here is the scenario. I am developing a logon system in windows 7. I have created a Credential Provider, containing one Credential. The Credential has three input fields, us
I do haven't done any work with the Windows Logon since GINA where left in the past, as PKI became the de-facto standard for credential storage. But...
Your question asked for some sample code, here is a full description
http://msdn.microsoft.com/en-gb/magazine/cc163489.aspx#S4
This is a little old, so it refers to smart cards, perhaps when you say token you are still talking about a smart card, but I suspect you mean a USB drive. However, if you attempting this level of development it should be fairly simple to swap code for Smart Card Read/Write and USB Read/Write.
You could try samples from windows sdk. There are sub authentication packages which are simpler to implement than full AP.
You can always write your own code that checks input with your data in database, there is many ways to do that. This is a video about smart and dull ways to do that.
and this is page about Custom Windows Authentication Package but I haven't really check that