Context-sensitive help is a way of getting the
  information you need without starting from the
  overview topic. It allows you to access information
  based on the context you are working in.

  To use this feature, you press the Help button on the
  keyboard, move the pointer over the subject on the
  screen that you want help on, then click MB1. This
  operation is just like using the Shift key on a
  typewriter. You hold down the Help key until you press
  and release MB1, then release the Help key.

  If context-sensitive help is available on the subject
  you have chosen, it is displayed by the Help system,
  just as it would be if you had found the information by
  navigating from the Overview.

  If there is no context-sensitive help on your chosen
  topic, nothing will happen. In this case, access help
  by choosing the Overview menu item from the Help menu.