Alternate Winlogon program

Dear /prog/

I'm writing a program to create an alternate way to log on to windows (instead of a password, you have to win a tron lightcycle type game). Where do I go in windows to change the entry box to this game? I know it's possible, because I've seen those display models in best buy with facial recognition logins from the webcam.

Love, Anon

Pic mostly related.

OP here, I'll admit, I came from /g/, and it's my first time here.
They're not quite as useful as you are.

/prog/ >> /g/