HP NonStop G-Series - Manual (Page 272)

What Is Screen Editing?
Page Mode Editing
C–2 058061 Tandem Computers Incorporated
As you use the various keys, notice the following:
The action takes place at the cursor.
You choose the 24 lines of text that appear on the screen by pressing
keys.
You control the lines of text on the screen by pressing keys.
You change the text in your EDIT file by typing over the text on the
screen.
You do not see line numbers on the screen.
The EDIT VS program reads the text on the terminal screen and changes the
text in your EDIT file to match the text on the screen. Figure C-1 illustrates
the concept of screen editing.