[extrapickles]

There were some good bugs in the login part of windows 2000/XP. Most of the ones I know of involve opening a browser while still on the login screen (my favorite was in the help for the screen reader), which is running as the System user that has complete control over the system.

[Lutzb]

IRC this was only possible on windows 95 and maybe 98.

[extrapickles]

They fixed most of them somewhere around XP SP2 or SP3, where they pretty much disabled help functionality on everything on the lock screen.

When Cortana was introduced, they had some issues of being able to launch the browser while the machine was still locked (though as the user that the computer was locked by). You couldn't do much as the previous bugs as the lock screen still covered everything.

[jl6]

You could do this on XP too.