How to save Windows credentials cache to disk

Hi all

I'm working on some single sign-on stuff, for logging into an iSeries using Kerberos. I have some Java code that uses jt400, which does all the heavy lifting itself for the most part.

Trouble is, we develop our Windows stuff primarily with VB.Net, and we use an IKVM wrapper around jt400 - actually very cool!

But that VM does not know how to retrieve the credentials from the system. When I use the Kinit method in java, it creates the credentials cache in a file on disk. Trouble is, I need to know the user's password - I mean, I should not need to run Kinit anyhow - we've already signed in to the Windows domain, and the ticket-granting ticket is already on the system.

As I understand it, Windows stores the credentials cache in some protected part of memory, not on disk. But there have to be ways to get the contents of the cache into a variable, right?

So does anyone know a VB .Net method for retrieving this? Or, failing that, which Windows API will do it?

And anyone who knows this - are you willing to share it here, or off-list?

Thanks
Vern