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Linux Unified Kernel is a computer operating system kernel intended to be binary-compatible with application software and device drivers made for Microsoft Windows and Linux. The Linux Unified Kernel project imports all the key features of the Windows operating system kernel into the Linux kernel to support Windows applications and device drivers. Linux Unified Kernel is primarily written in the C programming language, and is licensed under the terms of the GNU General Public License. Although the project is in the alpha development stage as of 2008, many Windows programs already work well. --- The Linux Unified Kernel project adds all Windows kernel mechanisms into the Linux kernel, including Process/thread management, Object management, virtual memory management, Synchronization, System calls, Windows Registry mechanism, WDM device driver framework, Windows DPC mechanism, etc to form a new kernel. This means that both Linux and Windows applications and device drivers can run directly on the new kernel. Although the Linux Unified Kernel combines the linux kernel with the Windows/ReactOS kernel, that doesn't mean the Linux Unified Kernel is an accumulation of the two kernels. In order to prevent it from becoming bloated, if a function has been achieved in ReactOS kernel, also can be achieved via using the Linux kernel (ReactOS codes as reference), Linux Unified Kernel prefers to use the last one. There are two syscall sets and their corresponding syscall tables in Linux Unified Kernel. One is the Window's, Windows applications call the syscall table via software interrupt "int 0x2e" to make system call, and the other is Linux's, Linux applications call syscall table via "int 0x80" to make system call. The Linux Unified Kernel project don't contain development of the Windows and the Linux userland libraries. Those libraries are offered by the Wine (or Windows/ReactOS) project and the Linux project. http://en.wikipedia.org/wiki/Linux_Unified_Kernel download link: http://www.reactos.org/forum/viewtopic.php?t=5240