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AT&T UWIN
The UWIN package is a project by David Korn and his colleagues to make a Unix environment available under Microsoft Windows. It is similar in structure to cygwin, discussed earlier. A shared library, posix.dll, provides emulation of the Unix system call APIs. The system call emulation is quite complete. An interesting twist is that the Windows registry can be accessed as a filesystem under /reg. On top of the Unix API emulation, ksh93 and over 200 Unix utilities (or rather, re-implementations) have been compiled and run. The UWIN environment relies on the native Microsoft Visual C/C++ compiler, although the GNU development tools are available for download and use with UWIN.
The project can be found at http://www.research.att.com/sw/tools/uwin/. The web site describes what is available, with links for downloading binaries, as well as information on commercial licensing of the UWIN package. Also included are links to various papers on UWIN, additional useful software, and links to other, similar packages.
