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The new Windows 10 login screen doesn't seem to support anything running on it, all I've seen is a duo security prompt that A. Only showed up after a login and B. Doesn't work on Windows 10 in a non-rdp session on a Microsoft account[0]. Sadly this also means you can't run something like Wallpaper Engine on the lock screen[1].

0: https://duo.com/docs/rdp-faq#can-i-use-duo-with-a-microsoft-...?

1: https://steamcommunity.com/app/431960/discussions/0/15001264...






The specific threat that ctrl-alt-delete's supposed to mitigate is where a user's already logged in, but a program's running that mimics the login prompt. Since applications can't handle ctrl-alt-del in Windows, if you pressed it at a fake login prompt, you'd get the Windows Security dialog/screen rather than a login prompt and it would be obvious that something's wrong.

Its utility's limited these days since consumer configurations of Windows have users trained not to expect to have to press ctrl-alt-del to log in. I'm not sure that it's even enabled by default on domain-joined machines any more as of Windows 10 (still available via Group Policy, though).


I've noticed sometimes the lock screen won't show the login dialog via the regular "press any keyboard key" action or via mouse dragging it up, I had to press ctrl-alt-delete. Maybe there are some heuristics that decide this that I don't know about.



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