cr3 \- controlled output flow filter for crt previewing
is a filter which allows causual examination of a continuous text
It normally pauses after each 23 lines of output.
If the user then hits a carriage-return, 23 more lines are displayed.
If the user hits control-d,
11 more lines are displayed (a ``scroll'').
It is also possible to type positive numbers to cr3 causing that
many lines to be printed, or negative numbers causing that many lines
to be discarded followed by a scroll.
mode by this program so that the output can be continuous.
The numbers and carriage returns you type will thus not show on your terminal.
nroff \-ms +2 doc.n | cr3
should be done optionally by the teletype driver in the system.
has its unusual name because Charles Haley
implemented such a feature,