There are many specialized newsgroups in Usenet. Most of them are in English a few of them are in other languages. The NL newsgroups are an example of these groups, they are newsgroups in Dutch. The Dutch language is very distinct and that is why they are given their own hierarchy for newsgroups. The NL extension is usually at the end of the newsgroup but some groups will contain the NL within the name. Some of the popular NL groups are alt.binaries.nl, alt.binaries.games.kidstuff.nl, alt.nl.ftp, and alt.crack.nl.
The NL newsgroups, just like any other newsgroups will carry everything a person can imagine. The text newsgroups are a great place for a person to find information on just about any topic they can think of, and converse with people in their own language. NL newsgroups are a good way to learn another culture as well, by viewing the discussions in these newsgroups you can learn the language in a way, and possibly see the different customs of this culture.
Having such diversity in Usenet is what makes it so great. You can connect with a person half way around the globe and not have to leave the comforts of your own home.