The Keyword... dialog box finds help topics that relate
  to a keyword you choose from a list of keywords.

  The available keywords are displayed in a list in the
  Keyword... dialog box. To use the keywords, either
  select one from the list, or enter one directly in the
  Keyword field at the top of the box. Then click on the
  Apply button.

  The Topic Titles list will then display all the titles
  which match your chosen keyword.

  After you have found the topic you require, select the
  topic in the usual way: double click on the topic to
  Go To Topic, or single click and then choose an
  operation by clicking on the desired push buttons.