I was working at a University computer lab using an early version of Novell Netware over Windows NT. Users were required to use "Ctrl-Alt-Delete" to get a login prompt. There are even pictures of this on-screen graphically representing what to do.
User: I can't get my login to work.
Me: Are you sure you're typing your user/name Password correctly?
User: No, I can't even get there.
Me: Oh. You need to press Ctrl-Alt-Delete to access that.
User: Oh, ok.
(5 minutes pass)
User: It's still not letting me.
Me: Ok. Lemme come and take a look at it. (at users station) Show me how you're logging in. I want to make sure the system hasn't locked up.
User: Like this--(With 3" long bubble gum pink finger nails 'clicking' against the screen, she 'presses' the pictures of the keys on the monitor.)