Yet it was running for three days before the admin got around to checking the machine, and all he did was try to log in, failed, and rebooted the machine — bringing it back to the real NetWare login screen. I got his password and pretty much everybody else's too, and to this day, more than 20 years later, I still use bits of his admin password from time to time when I'm creating temporary accounts.
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 have no idea how network drives were managed with NetWare, but some students always managed to find world writable dirs (that shouldn't be). Then it was a matter of finding some obscure subdirectory, create a new one (typically containing alt+255 characters) and stick games there. Fun times.
We did get his password (and many others), but never actually did anything with it.
Mine would print the "typo" error message, save credentials, and then log me out and show you the real login screen.
I managed to get the passwords of every student and teacher, but alas, I stored them in a file called hacked_passwords.txt , in my home directory. Got busted, and got a dozen saturday detentions.
Instareboot on a DOS machine.