Issue 4, 1990s: Spec 1170 In the early 1990s, a separate effort known as the Common API Specification or Spec 1170 was initiated by several major vendors, who formed the COSE alliance in the wake of the Unix wars. In 1993, Spec 1170 was assigned by COSE to X/Open for fasttrack. In October 1993, a planned transfer of UNIX trademark from Novell to X/Open was announced; it was finalized in 2nd quarter of 1994. Spec 1170 would eventually become the Single Unix Specification. 1994: Single UNIX Specification In 1994, the X/Open Company released the Single UNIX Specification. The SUS was made up of documents that were part of the X/Open Common Applications Environment (CAE): System Interface Definitions, Issue 4, Version 2 System Interfaces and Headers, Issue 4, Version 2 Commands and Utilities, Issue 4, Version 2 Networking Services, Issue 4 This was a repackaging of the X/Open Portability Guide (XPG), Issue 4, Version 2. Sources differ on whether X/Open Curses, Issue 4, Version 2 was part of this SUS; its copyright date is given as 1996. X/Open Curses, Issue 4 was published in 1995. In October 1994, X/Open indicated they were going to refer to Spec 1170 as '"Single-Unix" specification'. The SUS was at the core of the UNIX 95 brand. This version had 1168 programming interfaces. This version of SUS was drawn from the following sources: XPG4 Base by X/Open System V Interface Definition, (SVID) Edition 3, Level 1 calls by AT&T Application Environment Specification (AES) by OSF Interfaces found in common use and not yet covered by a formal specification, drawn from a survey of major applications. 1997: Single UNIX Specification, version 2 In 1996, X/Open merged with Open Software Foundation (OSF) to form The Open Group. In 1997, the Open Group released the Single UNIX Specification, Version 2. This specification consisted of: System Interface Definitions, Issue 5, System Interfaces and Headers, Issue 5, Commands and Utilities, Issue 5, Networking Services, Issue 5, X/Open Curses, Issue 4, Version 2, and was at the core of the UNIX 98 brand. This version had 1434 programming interfaces. 2001: Single UNIX Specification, version 3, POSIX.1-2001 Beginning in 1998, a joint working group of IEEE, ISO JTC 1 SC22 and The Open Group known as the Austin Group began to develop the combined standard that would be known as the core of Single UNIX Specification, Version 3 and as POSIX.1-2001. It was