The Help window Using Help menu contains the On
  Window... item.

1  –  Menus Help Help

  The On Window... item on the Using Help menu displays
  information about how to use help.

2  –  Menus Help About

  The On Version... item on the Using Help menu
  displays information about the current software
  name and version. It includes the copyright notice
  and an additional topic with trademark and product
  information.

3  –  Menus Help Glossary

  The On Terms... item on the Using Help menu displays
  a glossary of help system terms. (It is not a general
  DECwindows glossary.)