Thanks for the cont-sys tip, good to know.

Yes, I have used \definesynonyms, but I need abbreviations to have  
three levels: the abbreviation itself, the meaning of abbreviation  
and the description of the abbreviation (for example, "WWW" is short  
for "World Wide Web" and is described as a "Worldwide interconnected  
mess of multimedia, which took off in early 90's."). ConTeXt synonyms  
seem to have two.

I'm sure there are a million ways of doing this. I decided to  
implement it from the ground up to learn some plain TeX. But now I  
need to integrate my macros with ConTeXt to make passing the lists  
graceful without extra auxiliary files and forced double runs.

And as for the reply button, I guess I have to subscribe to get the  
mails in my mailbox. I'll do that now ;)

Jyrki