I used to have a job doing this at a different REC in the mid 2000s and we had terminals that I think were connected to some mainframe system.
The keyboard layout was custom for the application like they show in the video. The software would expect numbers at certain times, so you'd just type numbers using the home row and it'd switch back over the alpha chars after you input the correct number of number chars.
The keyboard layout was custom for the application like they show in the video. The software would expect numbers at certain times, so you'd just type numbers using the home row and it'd switch back over the alpha chars after you input the correct number of number chars.