A link to explain extensions to my Mother please

I am writing a section for OOo documentation for publication
that 
describes OOo Extensions (as in, what are they, how to
import, and how 
to activate). The target audience is interested in creating
macros using 
the macro recorder; and I have a lot of text regarding that
complete 
with pictures.

I spent a couple of hours following links and such, but I am
still a bit 
confused. A link to a simple extension that is packaged and
ready for 
activation would be great, preferably with a little readme
that says "to 
install this extension, do ....."

If you care, this is what I have so far.

An extension is a package that can be installed into
OpenOffice.org to 
add new functionality. An extension, which can be written in
almost any 
programming language, may be very sophisticated or simple.
Extensions 
can be grouped into types:

* Calc Add-Ins provide new functionality for Calc, including
new 
functions that act like normal built in functions.

* New components and functionality, which normally include
some level of 
UI integration such as new menus or toolbars.

* Data pilots, which can be used directly in Calc.

* Chart Add-Ins with new chart types.

* Linguistic components such as spell checkers.

* Document templates and images.

Although individual extensions may be found in different
places, there 
is an extension repository here: 
http://wiki.services.openoffice.org/wiki/Extension
s_repository


?? How to import and activate an extension ??


-- 
Andrew Pitonyak
My Macro Document: http://www.pi
tonyak.org/AndrewMacro.odt
My Book: http://w
ww.hentzenwerke.com/catalog/oome.htm
Info:  http://www.pitonyak.or
g/oo.php
See Also: http://documentation.openoffice.org/HOW_TO/index.html

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