on June 30, 2003. 10.24 This is a Virtual Vault release of HP-UX, providing enhanced security features. Virtual Vault is a compartmentalised operating system in which each file is assigned a compartment and processes only have access to files in the appropriate compartment and unlike most other UNIX systems the superuser (or root) does not have complete access to the system without following correct procedures. 10.30 (1997) This was primarily a developer release with various incremental enhancements. It provided the first support for kernel threads, with a 1:1 thread model (each user thread is bound to one kernel thread). 11.00 (1997) The first HP-UX release to also support 64-bit addressing. It could still run 32-bit applications on a 64-bit system. It supported symmetric multiprocessing, Fibre Channel, and NFS PV3. It also included tools and documentation to convert 32-bit code to 64-bit. 11.04 Virtual Vault release. 11.10 This was a limited release to support the HP 9000 V2500 SCA (Scalable Computing Architecture) and V2600 SCA servers. It also added JFS 3.3, AutoFS, a new ftpd, and support for up to 128 CPUs. It was not available separately. 11.11 (2000) 11i v1 This release of HP-UX introduced the concept of Operating Environments. It was released in December 2000. These are bundled groups of layered applications intended for use with a general category of usage. The available types were the Mission Critical, Enterprise, Internet, Technical Computing, and Minimal Technical OEs. (The last two were intended for HP 9000 workstations.) The main enhancements with this release were support for hard partitions, Gigabit Ethernet, NFS over TCP/IP, loadable kernel modules, dynamic kernel tunable parameters, kernel event Notifications, and protected stacks. 11.20 (2001) 11i v1.5 This release of HP-UX was the first to support the new line of Itanium-based (IA-64) systems. It was not intended for mission critical computing environments and did not support HP's ServiceGuard cluster software. It provided support for running PA-RISC compiled applications on Itanium systems, and for Veritas Volume Manager 3.1. 11.22 (2002) 11i v1.6 An incremental release of the Itanium version of HP-UX. This version achieved 64-way scalability, m:n threads, added more dynamic kernel tunable parameters, and supported HP's Logical Volume Manager on Itanium. It was built from the 11i v1 source code stream. 11.23 (2003) 11i v2 The original release of this version was in September 2003 to support the Itanium-based systems. In September 2004 the OS was updated to