Can I display a form on top of or next to the Windows Vista login screen?

Question

I need to display warnings and such on the screen at any time when the computer is running. We have a service that collects these events, so this is not a problem, but I need to find a way to display critical alerts even if the user is not logged in yet; that is, they are sitting in the "Press Ctrl-Alt-Delete to log in" window.

Is it possible? If so, can this be done using managed code (C #)?

Answer 1

In Windows XP and earlier, the system you will work with is GINA. This has changed in Vista and Windows 7 to "Credential Providers". See here for some background.