JSI Tip 4333. How do I manage stored user names and passwords on a Windows XP computer that is a member of a domain?

Microsoft Knowledge Base Article 306992 contains the following summary:

This article describes how to manage stored user names and passwords on a computer that is a member of a domain.

Stored User Names and Passwords is a secured store for password information. With this feature, you can enter user names and passwords for various network resources and applications (such as e-mail) once, and then have Windows automatically supply that information for subsequent visits to those resources without your intervention.