AT&T 7406BIS - Manual (Page 50)

Shift ✓
To use the Shift feature 1 Press [
Shift ] to access any of the top-labeled features on
buttons with split labels
●
Green light goes on
2 Press the split-labeled button whose top feature you
want to use
Note: When you press a feature button, the green light
for [
Shift
] automatically goes off; begin again at step 1
to use another top-labeled feature.