Somewhere around the start of most YaBB functions, (I'm looking in the file I have open, Display.pl, looking at sub Display) you'll find a line that looks like:
my ($variable, $var1, $var2, etc);
That has most of the variables that are used in that function. There are some other variables that are global, but I think that's what you're looking for.

Thanks AK 

Also make sure to check Variables/Settings.pl, Variables/advsettings.txt, and Variables/secsettings.txt for settings.

$name - $realname
$settings[7] - use $iamadmin, $iamgmod, or ${$uid.$username}{'position'}

$sourcedir is the same
$moderators{$username} - use $iammod or &is_moderator($user)

Variables beginning with $m (that regard messages) are the same.

$nestedquotes is now a setting, I think. You may want to check that out.

---

$threadpost and $tmpuname I don't know about.

Feel free to add it to the  YaBB Codex.

I gave it a shot... tried to edit the "Modification" category - since it didn't exist.  But it kept giving me errors and would not save my work.  In effect, without posting the message in a totally unrelated area, I can't do it.  Do you belong to YaBB Codex, AK?

If so, and if you have a better handle on how to get things implemented, could you post for me?  Here is the formatted detail:

=Modification=
==Variables==
There are a wide variety of variables in use in the YaBB scripts.  In order to modify the YaBB scripting, you should have a good knowledge of the variables in play.
===YaBB 1.4===
This article is an attempt to define those variables in use in YaBB 1.4
===YaBB 2.1===
This article is an attempt to define those variables in use in YaBB 2.1.
====A====
'''$addmembergroup{$user}'''
::User's additional groups, comma separated.
====B====
====C====
====D====
====E====
====F====
====G====
====H====
====I====
'''$iamadmin'''
::True if the user is the administrator.
'''$iamgmod'''
::True if the user is a Global Moderator.
'''$iamguest'''
::True if the user is a guest user.
'''$iammod'''
::True if the current user is a moderator (or membergroup moderator) of any board.
'''$imagesdir'''
::The images directory URL.
====J====
====K====
====L====
'''$language'''
::The current language of the current user.
====M====
'''$mattach'''
::Any attachment on the message in question.
'''$mdate'''
::Date of the posted message in question.
'''$memail'''
::Email of the person who posted the message in question.
'''$memberunfo{$user}'''
::User's group name, as it should be displayed.
'''$micon'''
::The chosen icon for the message in question.
'''$mip'''
::The IP address of the person who posted the message in question.
'''$mmessage'''
::The body of the message in question.
'''$mname'''
::Alias of the person who posted the message in question.
'''$msubject'''
::Subject line of the message in question.
'''$musername'''
::Actual login user name of the person who posted the message in question.
====N====
====O====
====P====
====Q====
====R====
'''$realemail'''
::Current email address of a user.
'''$realname'''
::The displayed alias that the user goes by - that shows up on messages.
====S====
'''$sourcedir'''
::Where the YaBBC.pl file is located.
====T====
====U====
'''$useboard'''
::The boardindex in use.
'''$usedisplay'''
::The display template in use.
'''$usehead'''
::The template.html in use.
'''$usemessage'''
::The messageindex template in use.
'''$useraccount{$user}'''
::Username value that is safe for use in links. (Otherwise having a # in the username breaks everything)
'''$username'''
::The one true global variable for the user ;). (Current username)
'''$usestyle'''
::The stylesheet in use.
====V====
====W====
====X====
====Y====
====Z====

{{Stub}}
 

If not, maybe you know who I should talk to about it?  There really was no contact ID on the Codex.

Edited:

For some reason the server is down, it's 10:43 on Monday, Sept 25th (PST).

I was going to go look up what this YaBBCodex is, I've never heard of it!

-Devon