The Help menu contains three menu items. The Help menu
  item provides access to the overview topic of the
  current application help library.

  The Glossary menu item visits the current application's
  glossary.

  The About menu item provides copyright information
  about the current application software.

  For further details, select the appropriate menu item
  from the list below.

1  –  Menus Help Help

  Choosing the overview causes a Help window to open,
  displaying the overview topic. All the help for the
  application is available from this topic. You make an
  appropriate selection from the list of additional
  topics.

  Not all the topic titles are displayed in the
  additional topics lists---the lists would get too
  long. If you do not see what you are looking for, pick
  something close, and then scan the additional topics
  list of the new topic. Alternatively, do a title search
  by selecting Title... from the Search menu.

  For example, in the overview topic for the Calendar
  application, only the menu names are displayed in the
  list, not the individual menu items. So here, you
  would choose the menu name first, and then select the
  menu item you are looking for from the next list.

2  –  Menus Help Glossary

  Choosing the Glossary menu item causes the Help
  Glossary to be displayed in a separate Help window. You
  can then select a term from the Glossary, which will
  cause its definition to be displayed in the Glossary
  window.

3  –  Menus Help About

  The About menu item provides information about the
  current application software, for example the  name,
  the copyright notice, and additional trademark and
  product information. This information provides legal
  protection for application software.