HP NonStop G-Series - Manual (Page 310)

How to Use REPLACE BLOCK
Page Mode Editing
C–40 058061 Tandem Computers Incorporated
3. You move the cursor to the end of the last line on the screen.
I am the very model of a modern Major-General,
I've information vegetable, animal, and mineral,
I know the kings of England, and I quote the fights
historical,
From Marathon to Waterloo, in order categorical;
I'm very well acquainted too with matter mathematical,
I understand equations, both the simple and quadratical,
About binomial theorem I'm teeming with a lot of news--
With many cheerful facts about the square of the
hypotenuse.
You press any one of the numbered function keys (F1 through F16).
When you press the function key, the text between the top left-hand
corner of the screen and the cursor is inserted back into the EDIT file.
At this point, the old text in the EDIT file that was displayed in the
block is replaced with the edited screen image.
Notice that the number of lines on the screen after editing need not
match the number displayed by EDIT. If fewer lines are present after
editing, lines in the EDIT file represented by the original screen image
are deleted accordingly (and there is a gap in the line numbers); if more
lines are present after editing, line numbers are adjusted (if possible) so
that the additional lines fit into the EDIT file.