An experiment in page makeup for troff output... -mpm is a version of standard -ms that causes extrainformation for vertical justification and figureplacement to be included in troff output.  Commands thathave been augmented to provide paddable space are 	.SH and .NH	.PP and .LP	no space if \n(PD is 0; normally .nr PD 0.3v; leave at least 1u	.IP and .QP	also	.EQ and .EN	.TS and .TE	no space if \n(TS is 0; normally .nr TS 0.5v	.PS and .PE	.P1 and .P2	display programs in CW font	.DS and .DE	.QS and .QE Other commands, registers, strings, etc.: 	.SP n		explicit paddable space, just like .sp n.			generally you should ALWAYS use .SP instead of .sp.			if you need exactly a given vertical space, you can say				.SP 3i exactly			this space won't be padded.	.Tm words	prints "words" and the output page number on stderr			sorry about the spelling; -ms pre-empted .TM	.NE n		like .ne.  note: does not cause a break 			Others may be added as the need arises. 	.nr FO n	Set the page length.  This value is the bottom of			the text on the page; a bottom title may lie below.			default is 10i (== 10 inches).	%o, %e		are strings containing odd and even page titles	%#		is the current page number (often useless)	.PT		is a macro invoked at the top of each "page";			it will normally use %e, %o and %#.  There is also			a .BT for page bottoms if desired.	.BP		force a page break	.FL		force all waiting figures out before any more running text	.1C, .2C	multiple columns;  number registers CW and GW set			the column and gutter width if you don't like the default.			absent a .FC command, all two-column contents collect			together on the page	.FC		freeze current two-column contents and start afresh.			necessary if you want to switch between 1 and 2 column			text and keep the relative order among them. Usage is some variant of 	... | troff -mpm /usr/lib/tmac/pm is the page-justifier itself;  it is called automaticallyby the -mpm macro package.  If you are installing this yourself, you willhave to edit the 2nd line of tmac.pm to arrange that pm is called directlyfrom troff. There are several lines in tmac.pm that say	.so /n/coma/usr/bwk/...You should delete these;  they are placeholders for some experiments. If you use -mm, you are more or less out of luck, although we will behappy to provide a crude and incomplete program that purports to convert-mm to -ms.  It may suggest what you need but it won't do the job. To compile pm, you need a C++ compiler, preferably release 2.0 or later.Put the .c and .h files in a directory, and type	makeThis process may well fail.  The usual cause is that different systemsput function declarations in different header files, and C++ insists thatall functions be properly declared.  You can almost always get through thispart by adding function declarations.  The most likely offender is malloc;a line like	extern char *malloc(int);near the top of slug.c will solve this one.  Bugs, etc.: 	not all -ms commands have been decorated;  in particular,	the rich variety of document types (TM, CSTR, etc.,) is not	really supported. 	there are problems with funny first pages and troff input	that moves back up the page. 	multiple columns:  only .2C is available.  The program does not check	whether something is wide or narrow:  user has responsibility to mark	which with .1C or .2C. 	headings are a bit tricky if you want things like	running titles that include the current section title.	normally a two-pass procedure using .Tm is needed.		It's a pain to force a blank vertical space of specified height.	Try this:		.de x		\v'\\$1'\0\h'-\w'\0'u'\c		..		.x 2.5i  If you want to roll your own, the following components areincluded in pm's "command language".  They are inserted inthe troff output in the form of "x X ..." commands, whichare created either by \X'...' or by the .X macro in -mpm.Look at how they are used in /usr/lib/tmac/tmac.pm for examples.  BS n	breakable stream	n = min # lines that must appear on page				use:  PP, LP, IP, ... US	unbreakable stream	use:  KS/KE, DS/DE, TS/TE, EQ/EN, PS/PE, etc. BF v	breakable float		v = preferred vertical location of box center				use:  FS/FE				use two successive BF's to give two preferences UF v	unbreakable float	v = preferred vertical location of box center				use:  KF/KE				use two successive UF's to give two preferences PT	page title		use:  user has absolute control between PT and END				no SP's or other pm commands inside are processed BT	bottom title		use:  user has absolute control between BT and END END	end			end a US, BF, UF, PT, or BT				all constructs nest, but a float within another float				or a US block will not float within or outside the block NE n	need			break page if a VBOX of height n would not fit on page				use:  .NE n SP n	space			paddable space of n				use:  .SP n PARM NP v			top of pm text at v	new page PARM FO v			bottom of pm text at v	footer			length of text on page = FO-NP PARM PL v			physical page ends at v	page length		default = FO + NP PARM MF x			tolerance to prevent padding	minimum fullness	default = 0.9 PARM CT x			tolerance for two-column operation	column tolerance	default = 0.5 PARM DBG x			debugging flag TM str	message			.Tm words prints <pageno> <tab> <words> on stderr MC n o	multiple column		n columns, offset o.				Only 1 and 2 columns will work. CMD BP	break page		force page break CMD FL	flush			force all queued figures out before any more				stream material is output CMD FC	freeze columns		force out current two-column contents;				start a fresh one Something like this will probably have to be added: NC	new column		HARD! Known botches in the existing implementation of pm: If a footnote is split across two pages, any associated separator linewill not be copied.  If there are multiple footnotes on one page, therewill be multiple separators too.  -mpm's .FS macro does not provide aseparator.  If you want a separator line, put it in explicitly witha call to the .FA macro. There are not enough settable parameters;  in particular, theway to control the height is a botch.  Historical note:  There is a simpler version of pm and -mpmcalled pj and -mpj that only does vertical justification ofpages that have already been laid out by conventional means.This simpler version may be adequate, but it is no longersupported and memory of how it works is growing dim.