How to display UI on logon screen in Windows 7

Question

I would like to display an UI that interacts with user on pre-logon screen (the screen where users usually enter their username/password)
I read that the architecture of

Answer 1

There's a reason it's HARD to do this kind of thing. Programs are minions of users. Pre-logon, there's (typically) no user to be a minion of. Its a security thing.

Just have your service fire off when a user logs in.