Information about using DECwindows, such as how to use
  windows, dialog boxes, and scroll bars, is available
  from Session Manager help.  A glossary of DECwindows
  terms is also available.  To get Session Manager help:

  1.  Move the pointer to the Session Manager icon (the
      icon with your user name and the name of your
      system) in the Icon Box.

  2.  Press mouse button 1 (MB1) twice quickly to display
      the Session Manager window.

  3.  Move the pointer to the Help menu; press and hold
      MB1 to pull down this menu.

  4.  Move the pointer to the Overview menu item and
      release MB1 to display information about using
      DECwindows.