Every topic that you select while in a Help session is
  recorded by the History... menu item. Selecting the
  History... menu item gives you see this record.

  Choose the History... menu item. A dialog box appears,
  listing all the topics viewed during the current Help
  session. The list is in chronological order, but
  duplicates are discarded.

  Select a 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.

  The Go Back button also uses the history record, in
  this case stepping back one topic at a time. The
  History... menu item provides a short cut if the topic
  you want is a long way back.