On the Type 'N Speak, the keystroke was shift+break. The break key acted as the help key when pressed by itself, and with shift, would put the unit in a mode where all the keys would do nothing except tell you what they did. My TNS hasn't worked for years, but I seem to remember it saying "learn mode," when this was turned on. Maybe, it was only on the TNS. I just assumed all the BNS line had basically the same features.
