    Copyright (C) 1989-2018 Free Software Foundation, Inc.

    Copying and distribution of this file, with or without modification,
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######################################################################

Beware!
This may be old information. Trust only the source. :-)

Implementation notes. (Or how to make your own national mm)

Different commands:

COVER [arg]
MT [arg [addressee]]
The arg is part of a filename in mm/*.MT or mm/*.cov.
This file is read when the macro is executed. Therefore it must be
put before any text output.
In each file there are definitions of all extra macros needed for the
cover sheet. MT files is only for compatibility reasons, and has several
limits due to that it don't know when the cover starts, and cannot
change sizes. Use COVER for new coversheet macros.

But with MT it is possible to write all of the AT&T covers.
An example can be found in mm/0.MT.

When writing a new cover using COVER, have in mind that the cover
should print the page with the COVEND macro. This macro
should be defined by the new macrofile.

Here is a part of ms.cov:
> .\"-----------------
> .de COVEND
> .sp |4.2c
> .cov@print-title
> .cov@print-authors
> .cov@print-firm
> .cov@print-abstract
> .cov@print-date
This is important, since COVER disables the page header.
> .pg@enable-top-trap
Should begin with page one (normally).
> .bp 1
And enable the trap at the page footer.
> .pg@enable-trap
> ..

#########################

Variables for covers:
I = integer
S = string
D = diversion
M = macro

Name			Type	Desc.
cov*au			I	The number of authors.

cov*title		M	Title collected with .TL.

cov*au!x!y		S	Author(s) given to .AU
cov*at!x!y		S	Author(s) title given to .AT
				x is the author-index [1-cov*au],
				y is the argument-index [1-9].
				Look at the table with indexes.

cov*firm		I	Author(s) firm.

cov*abs-arg		I	Argument to abstract.

cov*abs-ind		I	Indent for abstract.

cov*abs-name		S	The string 'ABSTRACT', changed with .AST

cov*abstract		M	The abstract.

cov*new-date		S	The date (todays date if ND is not used)

cov*mt-type		S	MT type
cov*mt-addresse 	S	MT addressee


##########################
Argument-index for cov*au:

Index		Desc.
1		name
2		initials
3		location
4		department
5		extension
6		room
7		arg 7
8		arg 8
9		arg 9

The location is set to the contents of string cov*location-xxxx
if location is equal to xxxx and cov*location-xxxx is defined
in the file locale.


Argument-index for cov*at:

Index		Desc.
1		title 1
.		.
.		.
9		title 9


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