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.