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dukjas, sorry, but there is no 'manual' as such. The best advice I can give you is to peruse the modules repository and see the available modules listed there. When you find one that seems like what you might want, search google for
'xoops modules/****/' and see what comes up (without the quotes) The other option os to install XSAS and install what looks suitable and play with them. There is also a site that lazybadger has
proving ground which has several modules installed just for testing.