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MOKKA (the shared database of Hungarian libraries) has Z39.50 support, but I've found nothing whatsoever describing the exact specifications or access on their website (www.mokka.hu), and the rules of use document is "Under Construction" on both the English and Hungarian versions of the website. blah.
However! The National Library (OSZK, NSZL) has this:
I know absolutely nothing about Z39.50, but this looks just like the information one would need to set LibraryThing up to access their database, and it's in English!
Could someone look into it? In exchange, I can rant and rave about the greatness of LibraryThing to my Hungarian friends ;)
Maybe with the parameters below, it could be made working here too:
Library: Magyar Országos Közös Katalógus