HP 9000 User Manual page 223

working directory
The current directory where the user's files will be placed by default.
WPI
Worldwide Portability Interface (functions which allow programming in a
codeset independent manner). WPI is based upon the Multibyte Support
Extension (MSE) to ISO /IEe 9899-1990.
X/Open
Glossary
An international standards group dedicated to an open software standard.
The group is concerned with standards selection and adoption, using
International Standards where they exist.
Glossary-12