software) and Chandler (for the graphics processor chip) were taken from the names of characters in the TV series Friends (Phoebe and Ursula were twin sisters in the series). This led to a number of rescue efforts to try to keep the Acorn desktop computer business alive. Acorn held discussions with many interested parties, and eventually agreed to exclusively licence RISC OS to RISCOS Ltd, which was formed from a consortium of dealers, developers and end-users. Pace purchased the rights to use and develop NCOS. There were also a number of projects to bring the advantages of the RISC Operating System to other platforms by the creation of the ROX Desktop to provide a RISC OS-like interface on Unix and Linux systems. The separate work by and Pace resulted in a code fork. This continued after the subsequent licensing agreement with Castle Technology, causing much community debate at the time. The debate remains ongoing in 2011. Work post-Acorn by RISCOS Ltd RISC OS 4 In March 1999, a new company called RISCOS Ltd was founded. They licensed the rights to RISC OS from Element 14 (and eventually from the new owner, Pace Micro Technology) and continued the development of OS 3.8, releasing it as RISC OS 4 in July 1999. Whilst the hardware support for Phoebe was not needed, the core improvements to RISC OS 3.80 could be finished and released. They included: a better file system, increasing the number of items in directory from 77 to approximately 88,000 and increasing the max length of a filename from 10 characters to 255 a plugin based system configuration utility a new screensaver API an enhanced window manager an updated interactive help application a redesigned set of icons According to the company, over 6,400 copies of RISC OS 4.02 on ROM were sold up until production was ceased in mid-2005. During 1999 and 2000, RISCOS Ltd also released versions of RISC OS 4 to support several additional hardware platforms, the MicroDigital Mico, MicroDigital Omega, RiscStation R7500 and the Castle Kinetic RiscPC. In 2003 a version of RISC OS 4 was released with support for the Millipede Graphics AlphaLock podule. RISC OS 4 is also available for various hardware emulators for other operating systems. In September 2003 VirtualAcorn released the commercial emulator VirtualRPC which included a copy of RISC OS 4.02. In December 2008 RISCOS Ltd made 4.02 available for non-commercial emulators for