To display information about using DECwindows, such
  as how to use windows, menus, dialog boxes, and scroll
  bars:

  1. Move the pointer to the Help menu on the Session
     Manager's menu bar.

  2. Press and hold MB1 to pull down this menu.

  3. Move the pointer to the On Basics menu item and
     release MB1.

     The Session Manager displays a Help window, which
     includes a list of additional topics about using
     DECwindows.