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Discussion in threads
Also nicknamed forum or blog, we have a place type you can activate using #define THREADS which lets you post multiline articles, reply to them in a threaded fashion, provide some rudimentary web interface to it and finally export it all in RSS for legacy syndication.
The condition of this code is unmaintained and we have no clue if anything of it really works. The code has been recovered and is even used for microblogging.