[development] How to disable any block or sidebar from module

Hi, I cannot find a generic way how to disable a sidebar programmatically. In my module, if some conditions are met, I would like to make sure that the whole sidebar (or any blocks in it) are not rendered at all, regardless of the theme. Could somebody advise, please? Sorry if it's obvious.. Thanks, *vacilando* -- Tomáš J. Fülöpp http://www.vacilando.org