HP Integrity NonStop H-Series - Manual (Page 220)

Hints on Using Joining
Adjusting the Text
058060 Tandem Computers Incorporated 9–9
When Joining Should Be Off
Sometimes, joining can cause unexpected results. The following are
examples of when joining should be off:
Your file contains columns of text. Joining causes columns to be run
together.
Your file contains text you’ve indented using the space bar or the TAB
key. Joining can move text that you want to stay on separate lines.
Your file contains examples or illustrations in which the placement of
text is critical. When you want the printed document to look exactly
like the display in your edit file, do not turn on joining.
Remember, you can stop joining by using SET JOIN OFF, or you can
interrupt joining for a single line by using the BREAK command.