Question about ICU Converter Explorer

Warning: I'm relatively new to ICU (though not to Unicode), and a 
considerably-less-than-expert programmer, so please be gentle!

I was wondering if someone would be kind enough to provide a general 
description or breakdown or even just some hints on how to get the 
"List of Languages Representable by This Codepage" as in the ICU 
Converter Explorer demo at 
http://oss.software.ibm.com/cgi-bin/icu/convexp (click on an Internal 
Converter Name link, then go to List of Languages toward the bottom). 
In a nutshell: how can I obtain a list of languages that a given 
codepage supports?

I've been looking in the ucnv.h and uloc.h documentation and I can use 
the functions no problem; what I'm not getting is how to establish the 
link between Converter/codepage -> Locale (and subsequently -> 
language(s)). With any luck I'm just overlooking something obvious and 
someone can just whack me on the head and set me in the right direction 
-- I'd appreciate that ;-)


Kind regards,

Joshua Hadley
Ascender Corporation
http://www.ascendercorp.com