what is a line editor?

Ive asked a lot of people this question and have never get a straight answer. If you do a web search you will see the same bullshit definition over and over, that it is an editor that only edited one line at a time before the advent of monitors. So can someone tell me exactly what you are physically looking at when using a line editor? If there is no screen what is the text being displayed on?

>>5
Why don't you just try one out and see?
>>6
Exactly.
Quit whining, OP, and go mess around with one instead.
WTF?? did you see the wikipedia definition I posted? here it is again:
a computer operator typically interacted with a teletype (essentially a printer with a keyboard), with no video display
a TELETYPE, did you get that?? where the fuck do I find a teletype to try a line editor? And ed is just a program that runs on a line editor. Admittedly I dont know exactly what Im talking about here because no one has given me an exact definition yet of what a line editor is