In information retrieval system includes a help feature, wherein a help key on a terminal can be actuated and a host computer responds by determining the identity of a page of basic information being transmitted at the time the help key is operated, determining the location of a page of subsidiary information...http://www.google.fr/patents/US4754326?utm_source=gb-gplus-shareBrevet US4754326 - Method and apparatus for assisting user of information retrieval systems
Method and apparatus for assisting user of information retrieval systems
