The NT4 login dialog looks like those of NT3.51 or Windows 2000 (and XP Pro if you switch do a domain-based login). See e.g. the one of Windows 2000 (on a machine visible not jointed to a domain) here: https://old.reddit.com/r/Windows10/comments/uyau0h/is_it_som.... And AFAIK there's no way to bypass NT login dialog.
Windows 3.11 to Windows 98 (and possibly later) let you click 'Cancel' at the login screen so you wouldn't need a user/pass at all to get access to the desktop. There was also the 'safe mode' option if the login prompt really was an obstacle. This easy login was a feature, not a bug.
My first thought too - this feels like that "F1 -> Open Help File -> Other... -> right-click on explorer.exe and select Run" method of bypassing login screen circa Windows 95/98.
That's similar to an old login bypass you used to be able to do on Windows 95. Here's a short gif demonstrating how it worked https://i.imgur.com/rG0p0b2.gif
I can't believe they haven't fixed that. I discovered that the login prompt ran with system-level privileges in Windows 95. I used it to play Duke3D in computer class when I was 14. You could press Ctl+Alt+Del to bring up Task Manager, from Task Manager you could choose to run a command, and run explorer.exe. It would start Windows with full admin access.
I always thought the password was for the network shares only. You could perfectly log in without a username and password, except networking partially fails. The login dialog only appeared after installing win9x networking components.
A windows password would have been silly, pressing F8 at boot would drop you in msdos
But there was an optional registry key that prevents the user from doing anything until after you were logged into the network. So practically, it was a login dialog.
Windows NT could always remotely log out the current user when part of a domain. We had tools in place for our lab administrators to logout users if they found locked workstations. With Windows 2000 you could automate this through group policy
I think that if you hit Cancel there it would work just as well. You wouldn't get it logged into the domain though
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