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A CDE Definition

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X/Open Portability Guide

An earlier name for standards that specified compliance with X/Open's Common Application Environment (CAE). XPG3 (1989) and XPG4 (1992) define operating systems, languages and protocols, etc. About half of the Single UNIX Specification (formerly Spec 1170) was taken from XPG4. The term "base" with XPG (XPG3 base, XPG4 base, etc.) referred to a minimum number of required APIs. See X/Open.


A consortium of international computer vendors that was founded in 1984 to resolve standards issues. Incorporated in 1987 and based in London, X/Open merged with the Open Software Foundation in 1996 to become The Open Group. See Open Group.

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Before/After Your Search Term
X-bandX out
X-basedX Phone
X BitmapX Pixelmap
X buttonX Pixmap
X CodeX protocol
x-heightx ratings
X Image ExtensionX Series
X JackX server
X libraryX standard
X/OpenX supplicant

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