MOSS 2007 Pre-Populate SSO Credentials

I'm looking to set a user's credentials for a 开发者_StackOverflow中文版particular webpart/application that utilizes the SSO database within Sharepoint. Can someone point me to a code sample of how I might do this in .net? The webpart/application typically stores the user's credentials upon the first use but I'd rather they not even be bothered with entering them at all.

---

I assume your integrating an existing .net application into SharePoint. If so, the following article should help you out:

SharePoint Single Sign-on: Part I, Part II

Also, if your looking to integrate SharePoint into an existing log-in system, you can implement a pluggable SSO Provider to do that for you. You can also integrate SharePoint and active directory (SO Question on the topic).