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.
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.