XPCC is a suite of dll forms used in development.
The new interim release includes the new namespace Steepvalley.Windows.Forms.Login that mimics some Login Features of Windows XP. The namespace includes a Login Control and a LoginList Control. While the single Login Control supports Authenticating and Authenticated Events for one user, you can use the Listcontrols for managing a group of users. You will receive the currently selected user, password and other info in the related Authenticating and Authenticated events. There is a small sample code included but I will publish a detailed documentation shortly.