.\" $Copyright:	$
.\" Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989, 1990 
.\" Sequent Computer Systems, Inc.   All rights reserved.
.\"  
.\" This software is furnished under a license and may be used
.\" only in accordance with the terms of that license and with the
.\" inclusion of the above copyright notice.   This software may not
.\" be provided or otherwise made available to, or used by, any
.\" other person.  No title to or ownership of the software is
.\" hereby transferred.
...
. \" $Header: add 1.3 86/03/06 $
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.tl 'May 15, 1977'''
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Summary of Changes to N/TROFF Since October 1976 Manual
.ft
.ta \niu
.in \niu
.h Options
.pp
-h	(Nroff only) Output tabs used during horizontal spacing
to speed output as well as reduce output byte count.
Device tab settings assumed to be every
8 nominal character widths.
The default settings of input (logical) tabs is also
initialized to every 8 nominal character widths.
.pp
-z	Efficiently suppresses formatted output.
Only message output will occur (from "tm"s and diagnostics).
.h "Old Requests"
.pp
\&.ad\ c	The adjustment type indicator "c" may now also be a number
previously obtained from the ".j" register (see below).
.pp
\&.so\ name	The contents of file "name" will be interpolated
at the point the "so" is encountered.
Previously, the interpolation was done upon return to the file-reading input level.
.h "New Request"
.pp
\&.ab\ text	\
Prints "text" on the message output and terminates
without further processing.
If "text" is missing, "User Abort." is printed.
Does not cause a break.
The output buffer is flushed.
.pp
\&.fz F N	\
forces f_ont "F" to be in siz_e N.
N may have the form N, +N, or -N.
For example,
     .fz 3 -2
.br
will cause an implicit \es-2 every time font 3 is entered,
and a corresponding \es+2 when it is left.
Special font characters occurring during the
reign of font F will have the same size modification.
If special characters are to be treated differently,
     .fz S F N
.br
may be used to specify the size treatment of special
characters during font F.
For example,
     .fz 3 -3
     .fz S 3 -0
.br
will cause automatic reduction of font 3 by 3 points
while the special characters would not be affected.
Any ``.fp'' request specifying a font on some position
must precede ``.fz'' requests relating to that position.
.h "New Predefined Number Registers."
.pp
\&.k	Read-only. Contains the horizontal size
of the text portion (without indent) of the current
partially collected output line, if any, in
the current environment.
.pp
\&.j	Read-only. A number representing the current adjustment mode and type.
Can be saved and later given to the "ad" request to restore a previous mode.
.pp
\&.P	Read-only.
1 if the current page is being printed,
and zero otherwise.
.pp
\&.L	Read-only.
Contains the current line-spacing parameter ("ls").
.pp
\&c.	General register access to the input line-number
in the current input file.
Contains the same value as the read-only ".c" register.
