reincorporation of AT&T's European and Asian Unix business operations as wholly owned subsidiaries of USL was completed. At that point the UNIX Software Operation was publicly rebranded as UNIX System Laboratories. Again, a point of emphasis was to separate the Unix-based business from AT&T's hardware-based business. The subsidiaries were known as UNIX System Laboratories Europe, Ltd., sited near Ealing Broadway in London, and UNIX System Laboratories Pacific, Ltd., located in Shiba, Tokyo. Dooling was named the initial president of USL, continuing from his position at USO. These organizational changes were taking place in the context of the open systems movement and the ongoing Unix wars. In consequence, the pro-AT&T side Unix International (as opposed to the anti-AT&T side Open Software Foundation) declared that "In the last 18 months AT&T has made good on its commitment to treat UNIX System as the industry asset it is and to open the UNIX System V development process to the entire industry." Unix System V work One unit within USL, called the UNIX System V Software business unit and headed by Michael J. DeFazio, was responsible for the development of the UNIX System V base technology. DeFazio had held a similar role within USO. The USO/USL staff was heavily involved in the creation of UNIX System V Release 4, which shipped in 1989 and was a joint project with Sun Microsystems. This work incorporated technology from a variety of Unix-based efforts, including UNIX System V, BSD, and Xenix. There were additions and new innovations as well from both the AT&T and Sun sides. System V Release 4 debuted at the Unix Expo trade show in New York in November 1989, in the form of source code availability for it as well as demonstrations from Unix International of SVR4-based applications running on seventeen different vendor platforms. End-user versions of Release 4 became available during 1990. Next USL engaged in an especially arduous effort into trying to satisfy the requirements of the National Computer Security Center's Trusted Computer System Evaluation Criteria ("Orange Book") to the B2 level. This manifested itself in System V Release 4.1 ES (Enhanced Security), which also included generally useful features such as support for dynamic loading of kernel modules. Following that, USL worked on System V Release 4.2, which was released in June 1992. InfoWorld characterized this effort as "at the core of an assault on the enterprise networking market," with a