.\" Copyright (C) Caldera International Inc. 2001-2002.  All rights reserved.
.\" 
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions are
.\" met:
.\" 
.\" Redistributions of source code and documentation must retain the above
.\" copyright notice, this list of conditions and the following
.\" disclaimer.
.\" 
.\" Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\" 
.\" All advertising materials mentioning features or use of this software
.\" must display the following acknowledgement:
.\" 
.\" This product includes software developed or owned by Caldera
.\" International, Inc.  Neither the name of Caldera International, Inc.
.\" nor the names of other contributors may be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\" 
.\" USE OF THE SOFTWARE PROVIDED FOR UNDER THIS LICENSE BY CALDERA
.\" INTERNATIONAL, INC.  AND CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
.\" DISCLAIMED.  IN NO EVENT SHALL CALDERA INTERNATIONAL, INC. BE LIABLE
.\" FOR ANY DIRECT, INDIRECT INCIDENTAL, SPECIAL, EXEMPLARY, OR
.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
.\" BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
.\" WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
.\" OR OTHERWISE) RISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
.\" IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\" 
.br
.tr |
.ce
.ft B
SUMMARY OF REQUESTS AND OUTLINE OF THIS MANUAL
.ft R
.de mx
.ev 2
.nf
.h1
.in
.sp
.fi
.ev
.ns
..
.xx
.h1 \s-1#\s+1 *
.fn
.sp .3
*Values separated by "\fB;\fR" are for \*(NR and \*(TR respectively.
.sp .2
\s-1#\s+1Notes are explained at the end of this Summary and Index
.ef
.mh
General Explanation
.mh
Font and Character Size Control
.bt
\fB&ps\fI\|\(+-N\fR	10\|point	previous	E	Point size; also \fB\es\fI\(+-N\fR.\(dg
.b1
\fB&fz\fI|F|\(+-N\fR	off	-	E	font \fIF\fR to point size \fI\(+-N\fR.
.b1
\fB&fz|S|\fIF|\(+-N\fR	off	-	E	Special Font characters to point size \fI\(+-N\fR.
.b1
\fB&ss\fI|N\fR	12\(sl36\|em	ignored	E	Space-character size
set to \fIN\fR\(sl36\|em.\(dg
.b1
\fB&cs\fI|F\|N\|M\fR	off	-	P	Constant character
space (width)
mode (font \fIF\^\fR\^).\(dg
.b1
\fB&bd\fI|F|N\fR	off	-	P	Embolden font \fIF\fR by \fIN\fR\(mi1 units.\(dg
.b1
\fB&bd|S|\fIF|N\fR	off	-	P	Embolden Special Font when current font is \fIF\fR.\(dg
.fn
.sp .2
\(dgNo effect in \*(NR.
.ef
.b1
\fB&ft\fI|F\fR	Roman	previous	E	Change to font
\fIF\fR|= \fIx\fR, \fIxx\fR, or 1-4.
Also \fB\ef\fIx\fR,\|\fB\ef(\fIxx\fR,\|\fB\ef\fIN\fR.
.b1
\fB&fp\fI|N|F\fR	R,I,B,S	ignored	-	Font named \fIF\fR mounted on physical position 1\(<=\fIN\fR\(<=4.
.mh
Page Control
.bt
\fB&pl\fI|\(+-N\fR	11\|in	11\|in	\fBv\fR	Page length.
.b1
\fB&bp|\fI\(+-N\fR	\fIN\(eq\fR1	-	B\(dd,\fBv\fR	\
Eject current page; next page number \fIN\fR.
.fn
.sp .2
\(ddThe use of "\ \fB\'\fR\ " as control character (instead of "\fB.\fR")
suppresses the break function.
.ef
.b1
\fB&pn\fI|\(+-N	N\(eq\fR1	ignored	-	Next page number \fIN\fR.
.b1
\fB&po\fI|\(+-N\fR	0;|26\(sl27\|in	previous	\fBv\fR	Page offset.
.b1
\fB&ne\fI|N\fR	-	\fIN\(eq\fR1\fIV\fR	D,\fBv\fR	Need \fIN\fR vertical space (\fIV\fR = vertical spacing).
.b1
\fB&mk|\fIR\fR	none	internal	D	Mark current vertical place in register \fIR\fR.
.b1
\fB&rt\fI|\(+-N\fR	none	internal	D,\fBv\fR	Return \fI(upward only)\fR to marked vertical place.
.mh
Text Filling, Adjusting, and Centering
.bt
\fB&br\fR	-	-	B	Break.
.b1
.lg 0
\fB&fi\fR	\(fill	-	B,E	Fill output lines.
.lg
.b1
\fB&nf\fR	fill	-	B,E	No filling or adjusting of output lines.
.b1
\fB&ad\fI|c\fR	adj,both	adjust	E	Adjust output lines with mode \fIc\fR.
.b1
\fB&na\fR	adjust	-	E	No output line adjusting.
.b1
\fB&ce\fI|N\fR	off	\fIN\(eq\fR1	B,E	Center following \fIN\fR input text lines.
.mh
Vertical Spacing
.bt
\fB&vs\fI|N\fR	1\(sl6in;12pts	previous	E,\fBp\fR	Vertical base line spacing (\fIV\fR\^).
.b1
\fB&ls\fI|N	N\(eq\fR1	previous	E	Output \fIN\(mi\fR1 \fIV\^\fRs after each text output line.
.b1
\fB&sp\fI|N\fR	-	\fIN\(eq\fR1\fIV\fR	B,\fBv\fR	Space \
vertical distance \fIN\fR \fIin either direction\fR.
.b1
\fB&sv\fI|N\fR	-	\fIN\(eq\fR1\fIV\fR	\fBv\fR	Save vertical distance \fIN\fR.
.b1
\fB&os\fR	-	-	-	Output saved vertical distance.
.b1
\fB&ns\fR	space	-	D	Turn no-space mode on.
.b1
\fB&rs\fR	-	-	D	Restore spacing; turn no-space mode off.
.mh
Line Length and Indenting
.bt
\fB&ll\fI|\(+-N\fR	6.5\|in	previous	E,\fBm\fR	Line length.
.b1
\fB&in\fI|\(+-N\fR	\fIN\(eq\fR\^0	previous	B,E,\fBm\fR	Indent.
.b1
\fB&ti\fI|\(+-N\fR	-	ignored	B,E,\fBm\fR	Temporary indent.
.mh
Macros, Strings, Diversion, and Position Traps
.bt
\fB&de\fI|xx|yy\fR	-	\fI.yy=\fB..\fR	-	Define or redefine macro \fIxx;\fR end at call of \fIyy\fR.
.b1
\fB&am\fI|xx|yy\fR	-	\fI.yy=\fB..\fR	-	Append to a macro.
.b1
\fB&ds\fI|xx|string\fR	-	ignored	-	Define a string \fIxx\fR containing \fIstring\fR.
.b1
\fB&as\fI|xx|string\fR	-	ignored	-	Append \fIstring\fR to string \fIxx\fR.
.b1
\fB&rm\fI|xx\fR	-	ignored	-	Remove request, macro, or string.
.b1
\fB&rn\fI|xx|yy\fR	-	ignored	-	Rename request, macro, or string \fIxx\fR to \fIyy\fR.
.b1
\fB&di\fI|xx\fR	-	end	D	Divert output to macro \fIxx\fR.
.b1
\fB&da\fI|xx\fR	-	end	D	Divert and append to \fIxx\fR.
.b1
\fB&wh\fI|N|xx\fR	-	-	\fBv\fR	Set location trap; negative is w.r.t. page bottom.
.b1
\fB&ch\fI|xx|N\fR	-	-	\fBv\fR	Change trap location.
.b1
\fB&dt\fI|N|xx\fR	-	off	D,\fBv\fR	Set a diversion trap.
.b1
\fB&it\fI|N|xx\fR	-	off	E	Set an input-line count trap.
.b1
\fB&em\fI|xx\fR	none	none	-	End macro is \fIxx\fI.
.mh
Number Registers
.bt
\fB&nr\fI|R|\(+-N|M\fR	-	-	\fBu\fR	Define and set number register \fIR\fR; auto-increment by \fIM\fR.
.b1
\fB&af\fI|R|c\fR	arabic	-	-	Assign format to register \fIR\fR (\fIc=\fB1\fR, \fBi\fR, \fBI\fR, \fBa\fR, \fBA\fR).
.b1
\fB&rr\fI|R\fR	-	-	-	Remove register \fIR\fR.
.mh
Tabs, Leaders, and Fields
.bt
\fB&ta\fI|Nt|...\fR	0.8;|0.5in	none	E,\fBm\fR	Tab settings; \fIleft\fR type, unless \fIt=\fBR\fR(right), \fBC\fR(centered).
.b1
\fB&tc\fI|c\fR	none	none	E	Tab repetition character.
.b1
\fB&lc\fI|c\fR	\fB.\fR	none	E	Leader repetition character.
.b1
\fB&fc\fI|a|b\fR	off	off	-	Set field delimiter \fIa\fR and pad character \fIb\fR.
.mh
Input and Output Conventions and Character Translations
.bt
\fB&ec\fI|c\fR	\e	\e	-	Set escape character.
.b1
\fB&eo\fR	on	-	-	Turn off escape character mechanism.
.b1
\fB&lg\fI|N\fR	-;\|on	on	-	Ligature mode
on if \fIN\fR>0.
.b1
\fB&ul\fI|N\fR	off	\fIN\(eq\fR1	E	Underline (italicize in \*(TR) \fIN\fR input lines.
.b1
\fB&cu\fI|N\fR	off	\fIN\(eq\fR1	E	Continuous underline in \*(NR; like \fBul\fR in \*(TR.
.b1
\fB&uf\fI|F\fR	Italic	Italic	-	Underline font set to \fIF\fR (to be switched to by \fBul\fR).
.b1
\fB&cc\fI|c\fR	\fB.	.\fR	E	Set control character to \fIc\fR.
.b1
\fB&c2\fI|c\fR	\fB\'	\'\fR	E	Set nobreak control character to \fIc\fR.
.b1
\fB&tr\fI|abcd....\fR	none	-	O	Translate \fIa\fR to \fIb\fR, etc. on output.
.mh
Local Horizontal and Vertical Motions, and the Width Function
.mh
Overstrike, Bracket, Line-drawing, and Zero-width Functions
.mh
Hyphenation.
.bt
\fB&nh\fR	hyphenate	-	E	No hyphenation.
.b1
\fB&hy\fI|N\fR	hyphenate	hyphenate	E	Hyphenate; \fIN =\fR mode.
.b1
\fB&hc\fI|c\fR	\fB\e%	\e%\fR	E	Hyphenation indicator character \fIc\fR.
.b1
\fB&hw\fI|word1|...\fR		ignored	-	Exception words.
.mh
Three Part Titles.
.bt
\fB&tl\fI|\'left\|\'center\|\'right\|\'\fR	-	-	Three part title.
.b1
\fB&pc\fI|c\fR	\fB%\fR	off	-	Page number character.
.b1
\fB&lt\fI|\(+-N\fR	6.5\|in	previous	E,\fBm\fR	Length of title.
.mh
Output Line Numbering.
.bt
\fB&nm\fI|\(+-N|M|S|I\fR	off	E	Number mode on or off, set parameters.
.b1
\fB&nn\fI|N\fR	-	\fIN\(eq\fR1	E	Do not number next \fIN\fR lines.
.mh
Conditional Acceptance of Input
.bt
\fB&if\fI|c|anything\fR	-	-	If condition \fIc\fR true, accept \fIanything\fR as input,
.b1
				for multi-line use \fI\e{anything\|\e}\fR.
.b1
\fB&if|!\fIc|anything\fR	-	-	If condition \fIc\fR false, accept \fIanything\fR.
.b1
\fB&if\fI|N|anything\fR	-	\fBu\fR	If expression \fIN\fR > 0, accept \fIanything\fR.
.b1
\fB&if|!\fIN|anything\fR	-	\fBu\fR	If expression \fIN\fR \(<= 0, accept \fIanything\fR.
.b1
\fB&if\fI|\|\'string1\|\'string2\|\'|anything\fR	-	If \fIstring1\fR identical to \fIstring2\fR,
accept \fIanything\fR.
.b1
\fB&if|!\fI\|\'string1\|\'string2\|\'|anything\fR	-	If \fIstring1\fR not identical to \fIstring2\fR,
accept \fIanything\fR.
.b1
\fB&ie\fI|c|anything\fR	-	\fBu\fR	If portion of if-else; all above forms (like \fBif\fR).
.b1
\fB&el\fI|anything\fR		-	-	Else portion of if-else.
.mh
Environment Switching.
.bt
\fB&ev\fI|N\fR	\fIN\(eq\fR0	previous	-	Environment switched (\fIpush down\fR).
.mh
Insertions from the Standard Input
.bt
\fB&rd\fI|prompt\fR\fR	-	\fIprompt=\s-1\fRBEL\s+1	Read insertion.
.b1
\fB&ex\fR	-	-	-	\
Exit from \*(NR\(sl\*(TR.
.mh
Input\(slOutput File Switching
.bt
\fB&so\fI|filename\fR		-	-	Switch source file \fI(push down)\fR.
.b1
\fB&nx\fI|filename\fR		end-of-file	-	Next file.
.b1
\fB&pi\fI|program\fR		-	-	Pipe output to \fIprogram\fR (\*(NR only).
.mh
Miscellaneous
.bt
\fB&mc\fI|c|N\fR	-	off	E,\fBm\fR	Set margin character \fIc\fR and separation \fIN\fR.
.b1
\fB&tm\fI|string\fR	-	newline	-	Print \fIstring\fR on terminal \
(\s-1UNIX\s+1 standard error output).
.b1
\fB&ig\fI|yy\fR	-	\fI.yy=\fB..\fR	-	Ignore till call of \fIyy\fR.
.b1
\fB&pm\fI|t\fR	-	all	-	Print macro names and sizes;
.b1
				if \fIt\fR present, print only total of sizes.
.b1
\fB&ab\fI|string\fR	-	-	-	Print a message and abort.
.b1
.lg 0
\fB&fl\fR	-	-	B	Flush output buffer.
.lg
.mh
Output and Error Messages
.xx
.nf
.rm mx
.ft R
\l'\n(.lu'
.ft B
.xx
.ta .3iC .6i
	Notes-
.xx
.ft R
	B	Request normally causes a break.
	D	Mode or relevant parameters associated with current diversion level.
	E	Relevant parameters are a part of the current environment.
	O	Must stay in effect until logical output.
	P	Mode must be still or again in effect at the time of physical output.
	\fBv\fR,\fBp\fR,\fBm\fR,\fBu\fR	Default scale indicator; if not specified, scale indicators are \fIignored\fR.
.br
.nr zz 11
.de cl
.ie \\n+(cl<\n(zz \{\
.	po +\\n(.lu/\n(zzu
.	rt
.\}
.el \{\
.po 26i/27u
.\}
..
.nr cl 0 1
.di zz
.ta .3iR
.nf
.ps 8
.vs 10
ab	20
ad	4
af	8
am	7
as	7
bd	2
bp	3
br	4
c2	10
cc	10
ce	4
ch	7
cs	2
cu	10
da	7
de	7
di	7
ds	7
dt	7
ec	10
el	16
em	7
eo	10
ev	17
ex	18
fc	9
fi	4
fl	20
fp	2
ft	2
fz	2
hc	13
hw	13
hy	13
ie	16
if	16
ig	20
in	6
it	7
lc	9
lg	10
li	10
ll	6
ls	5
lt	14
mc	20
mk	3
na	4
ne	3
nf	4
nh	13
nm	15
nn	15
nr	8
ns	5
nx	19
os	5
pc	14
pi	19
pl	3
pm	20
pn	3
po	3
ps	2
rd	18
rm	7
rn	7
rr	8
rs	5
rt	3
so	19
sp	5
ss	2
sv	5
ta	9
tc	9
ti	6
tl	14
tm	20
tr	10
uf	10
ul	10
vs	5
wh	7
.di
.nr aa \n(dn/\n(zz
.ne \n(aau+10p
.sp
.ft B
Alphabetical Request and Section Number Cross Reference
.ft
.sp .3
.wh \n(nlu+\n(aau cl
.nr qq \n(nlu+\n(aau
.ps
.vs
.mk
.zz
.rt
.sp \n(.tu
.ch cl 12i
.sp
.bp
.nf
.ft B
Escape Sequences for Characters, Indicators, and Functions
.ft R
.xx
.TS
c2l
c2l2l
n2l2l.
.ft I
.bd I 3
Section	Escape
Reference	Sequence	Meaning
.ft R
.bd I
.xx
10.1	\fB\e\e\fR	\e (to prevent or delay the interpretation of \e\|)
10.1	\fB\ee\fR	Printable version of the \fIcurrent\fR escape character.
2.1	\fB\e\'\fR	\' (acute accent); equivalent to \fB\e(aa\fR
2.1	\fB\e\`\fR	\` (grave accent); equivalent to \fB\e(ga\fR
2.1	\fB\e\-\fR	\- Minus sign in the \fIcurrent\fR font
7	\fB\e\^.\fR	Period (dot) (see \fBde\fR)
11.1	\fB\e\fR(space)	Unpaddable space-size space character
11.1	\fB\e0\fR	Digit width space
.tr ||
11.1	\fB\e\||\fR	1\(sl6\|em narrow space character (zero width in \*(NR)
.tr |
11.1	\fB\e^\fR	1\(sl12\|em half-narrow space character (zero width in \*(NR)
.tr &&
4.1	\fB\e&\fR	Non-printing, zero width character
.tr &.
10.6	\fB\e!\fR	Transparent line indicator
10.7	\fB\e"\fR	Beginning of comment
7.3	\fB\e$\fIN\fR	Interpolate argument 1\(<=\fIN\fR\(<=9
13	\fB\e%\fR	Default optional hyphenation character
2.1	\fB\e(\fIxx\fR	Character named \fIxx\fR
7.1	\fB\e\(**\fIx\fR,|\fB\e\(**(\fIxx\fR	Interpolate string \fIx\fR or \fIxx\fR
9.1	\fB\ea\fR	Non-interpreted leader character
12.3	\fB\eb\fI\'abc...\|\'\fR	Bracket building function
4.2	\fB\ec\fR	Interrupt text processing
11.1	\fB\ed\fR	Forward (down) 1\(sl2\|em vertical motion (1\(sl2 line in \*(NR)
2.2	\fB\ef\fIx\fR,\fB\ef(\fIxx\fR,\fB\ef\fIN\fR	Change to font named \fIx\fR or \fIxx\fR, or position \fIN\fR
11.1	\fB\eh\fI\'N|\'\fR	Local horizontal motion; move right \fIN\fR \fI(negative left)\fR
11.3	\fB\ek\fIx\fR	Mark horizontal \fIinput\fR place in register \fIx\fR
12.4	\fB\el\fI\|\'Nc\|\'\fR	Horizontal line drawing function (optionally with \fIc\fR\|)
12.4	\fB\eL\fI\'Nc\|\'\fR	Vertical line drawing function (optionally with \fIc\fR\|)
8	\fB\en\fIx\fR,\fB\en(\fIxx\fR	Interpolate number register \fIx\fR or \fIxx\fR
12.1	\fB\eo\fI\'abc...\|\'\fR	Overstrike characters \fIa, b, c, ...\fR
4.1	\fB\ep\fR	Break and spread output line
11.1	\fB\er\fR	Reverse 1\|em vertical motion (reverse line in \*(NR)
2.3	\fB\es\fIN\fR,\|\fB\es\fI\(+-N\fR	Point-size change function
9.1	\fB\et\fR	Non-interpreted horizontal tab
11.1	\fB\eu\fR	Reverse (up) 1\(sl2\|em vertical motion (1\(sl2 line in \*(NR)
11.1	\fB\ev\fI\'N\|\|\'\fR	Local vertical motion; move down \fIN\fR \fI(negative up)\fR
11.2	\fB\ew\fI\'string\|\'\fR	Interpolate width of \fIstring\fR
5.2	\fB\ex\fI\'N\|\|\'\fR	Extra line-space function \fI(negative before, positive after)\fR
12.2	\fB\ez\fIc\fR	Print \fIc\fR with zero width (without spacing)
16	\fB\e{\fR	Begin conditional input
16	\fB\e}\fR	End conditional input
10.7	\fB\e\fR(newline)	Concealed (ignored) newline
-	\fB\e\fIX\fR	\fIX\fR, any character \fInot\fR listed above
.TE
.fi
.sp
The escape sequences
\fB\e\e\fR,
\fB\e\^.\fR,
\fB\e"\fR,
\fB\e$\fR,
\fB\e\(**\fR,
\fB\ea\fR,
\fB\en\fR,
\fB\et\fR,
and
\fB\e\fR(newline) are interpreted in \fIcopy mode\fR (\(sc7.2).
.bp
.ft B
.nf
Predefined General Number Registers
.ft
.TS
c2l
c2l2l
n2l2l.
.ft I
.bd I 3
Section	Register
Reference	Name	Description
.ft R
.bd I
.xx
3	\fB%\fR	Current page number.
19	\fBc&\fR	Number of \fIlines\fR read from current input file.
11.2	\fBct\fR	Character type (set by \fIwidth\fR function).
7.4	\fBdl\fR	Width (maximum) of last completed diversion.
7.4	\fBdn\fR	Height (vertical size) of last completed diversion.
-	\fBdw\fR	Current day of the week (1-7).
-	\fBdy\fR	Current day of the month (1-31).
11.3	\fBhp\fR	Current horizontal place on \fIinput\fR line (not in ditroff)
15	\fBln\fR	Output line number.
-	\fBmo\fR	Current month (1-12).
4.1	\fBnl\fR	Vertical position of last printed text base-line.
11.2	\fBsb\fR	Depth of string below base line (generated by \fIwidth\fR function).
11.2	\fBst\fR	Height of string above base line (generated by \fIwidth\fR function).
-	\fByr\fR	Last two digits of current year.
.TE
.sp
.ft B
Predefined Read-Only Number Registers
.ft R
.TS
c2l
c2l2l
n2l2l.
.ft I
.bd I 3
Section	Register
Reference	Name	Description
.ft R
.bd I
.xx
7.3	\fB&$\fR	Number of arguments available at the current macro level.
-	\fB&A\fR	Set to 1 in \*(TR, if \fB\-a\fR option used; always 1 in \*(NR.
11.1	\fB&H\fR	Available horizontal resolution in basic units.
5.3	\fB&L\fR	Set to current \fIline-spacing\fR (\fBls\fR) parameter
-	\fB&P\fR	Set to 1 if the current page is being printed; otherwise 0.
-	\fB&T\fR	Set to 1 in \*(NR, if \fB\-T\fR option used; always 0 in \*(TR.
11.1	\fB&V\fR	Available vertical resolution in basic units.
5.2	\fB&a\fR	Post-line extra line-space most recently utilized \
using \fB\ex\fI\'N\|\'\fR.
19	\fB&c\fR	Number of \fIlines\fR read from current input file.
7.4	\fB&d\fR	Current vertical place in current diversion; equal to \fBnl\fR, if no diversion.
2.2	\fB&f\fR	Current font as physical quadrant (1-4).
4	\fB&h\fR	Text base-line high-water mark on current page or diversion.
6	\fB&i\fR	Current indent.
4.2	\fB&j\fR	Current adjustment mode and type.
4.1	\fB&k\fR	Length of text portion on current partial output line.
6	\fB&l\fR	Current line length.
4	\fB&n\fR	Length of text portion on previous output line.
3	\fB&o\fR	Current page offset.
3	\fB&p\fR	Current page length.
2.3	\fB&s\fR	Current point size.
7.5	\fB&t\fR	Distance to the next trap.
4.1	\fB&u\fR	Equal to 1 in fill mode and 0 in nofill mode.
5.1	\fB&v\fR	Current vertical line spacing.
11.2	\fB&w\fR	Width of previous character.
-	\fB&x\fR	Reserved version-dependent register.
-	\fB&y\fR	Reserved version-dependent register.
7.4	\fB&z\fR	Name of current diversion.
.TE
.in 0
.fi
.ps 10
.vs 12
.ft R
.bp