How QtClucene work?
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Qt uses clucene for searching in the help documents. As far as I know clucene is a C port of the Java lucene. Unfortunately there is no documentation around, but you may want to have a look at the documentation and help modules' sources in the Qt source tree. 
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There is no Qt-like interface for using QtLucene (=CLucene) in your app. 
 What a pity!!!You have to compile+link the sources in your app and use CLucene API, like: int iFlags = lucene::document::Field::STORE_YES | lucene::document::Field::INDEX_TOKENIZED; 
 lucene::document::Document doc;
 doc.add(*(_CLNEW lucene::document::Field(tFieldName, tFieldVal, iFlags)));
 writer.addDocument(&doc);search: 
 lucene::analysis::WhitespaceAnalyzer analyzer;
 m_pQuery = lucene::queryParser::QueryParser::parse(a,_T("text"),&analyzer);
 lucene::search::IndexSearcher searcher(sDirOfIndex);
 m_pHits = searcher.search(m_pQuery);
