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You are here: Certification > The Open Brand > Register of Open Branded Products > List of Product Standards > X Window System Application Interface V2

X Window System Application Interface V2

Category: Desktop [UB]

This Product Standard provides X Window System user interface services to applications via a programmatic interface. It includes the Xlib interface, the X Protocol, ICCCM, and the Xt Intrinsics, at the X11 Release 5 level. It is optional whether the displays are local and/or remote and whether they employ the X Protocol (that is, the focus of this Product Standard is application portability).

Product Standards are explained in Practical Guide to the Open Brand

Click for a Web version of the Product Standard

Click for full text of the Product Standard Definition: in PDF Format

Referenced Documents:

Window Management (X11R5): Xlib - C Language Binding

Window Management (X11R5): X Window System Protocol

Window Management (X11R5): X Toolkit Intrinsics

Window Management (X11R5): File Formats & Application Conventions

Conformance Statement Questionnaires:

CSQ for Window System Application Interface V2 Product Standard

Test Suites:


Present in Common Desktop Environment Product Standard(s)

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