Frequently Asked Questions

What systems are registered UNIX systems?

What is the Open Brand?

Why is the Open Brand valuable?

What is the difference between the XPG4 and the UNIX brand?

What is the difference between Spec 1170 and the Single UNIX Specification?

Is the Single UNIX Specification available on the world wide web?

What is the status of the UNIX Brand transfer?

What types of product can bear the UNIX Brand?

What is the difference between UNIX 93 , UNIX 95 and UNIX 98?

What is a "Unix-like" operating system?

What are the requirements for the UNIX 95 and UNIX 98 brands?

Does The Open Group sell UNIX systems source code?

Does the sale of Novell's UNIX systems business to SCO mean that The Open Group is no longer involved?

Some vendors say that they already have a licence for the UNIX trade mark from Novell or USL, is this true?

[Further notes on using the UNIX Trade mark]

If a vendor licenses UNIX source code from Novell, why do they need a TMLA from The Open Group?

Can software carry the brand without hardware?

What is the UNIX trade mark fee structure?

Why do we need XPG4 Base when we have the XPG4 UNIX profile definition?

Can all my products use the UNIX trade mark?

What test suites do I need for the UNIX brand?

[Further information on X/Open testing]

How will customers know UNIX Branded products from older UNIX systems?

What are the usage guidelines for the UNIX trade mark?

[Further notes on using the UNIX Trade mark]

Does the UNIX brand replace the XPG4 Base brand?

Why is this the Open Brand so important?

How does the Common Desktop Environment( CDE ) relate to UNIX systems?

Will the UNIX Brand criteria allow Microsoft to brand NT or others to brand proprietary environments?

Some trade mark attributions still say Novell (or even AT&T or Bell Labs), which is correct?

[Further notes on using the UNIX Trade mark]


What are the test suites associated with the Open Brand?

What about POSIX conformance? Many vendors claim it, are there tests?

What about the Internet? Is the Open Brand relevant to the Internet?

The UNIX 98 Server Product includes the platform independent Internet Server product standard, including mandatory Java TM runtime environment and internet and intranet services. This a defacto definition of an open server platform for supporting todays internet based services.

What about the Year 2000?

Y2K handling for interfaces within the Single UNIX Specification for UNIX 98 is explicitly defined in Version 2 of that specification, published in February 1997. A paper detailing the specific changes, and recommended changes to UNIX 95 systems is available at Test programs to check for rollover handling on UNIX systems are available at the URL

UNIX 98 systems are required to process dates up to at least Jan 1st 2038, please note that this is 38 years later than the last date required by POSIX 1003.2-1992.

Vendors providing 64-bit based UNIX 98 systems, and supporting 64-bit time_t have reported their ability to process dates to the year 9999

Single UNIX Specification UNIX Documentation Registered Products catalog White papers UNIX API Tables
UNIX and the Year 2000 Test tool downloads About The Open Group The Authorized Guide to UNIX 98 UNIX Resources

Copyright © 1997-1998 , The Open Group.