The delete key must be pressed last for the alt-ctrl-del security sequence to work in NT. You can hold down alt and ctrl, then press del and it will work. Make delete anything but the last key to be pressed and it will not work. Hold down alt-del, press ctrl - nada. Hold down ctrl-del, press alt - nada. The delete key press must be last. Try it yourself.

Covers installation and support of NT Workstation. If you are just getting into NT workstation, its a good book. If you are experienced NT techie, forget it.