Source : Free On-Line Dictionary of Computing

ISMAP
     
        (World-Wide Web) An attribute of the {HTML} tag  (inline
        image) which specifies that if the image is selected, the
        {browser} will generate a request indicating the coordinates
        of the point which was clicked.  This request is then
        interpreted by the server by mapping certain regions of the
        image to certain actions.
     
        {Documentation
        (http://www.utirc.utoronto.ca/HTMLdocs/NewHTML/image.html)}.
     
        (1995-02-14)