http://www.eweek.com/article2/0,3959,1123176,00.asp The source, who has seen both the Unix System V source code and the Linux source code and who assisted with a SCO project to bring the two kernels closer together, [...] "During that project we often came across sections of code that looked very similar, in fact we wondered why even variable names were identical. It looked very much like both codes had the same origin, but that was good as the implementation of 95 percent of all Linux system calls on the Unix kernel turned out to be literally 'one-liners'" Only a handful of system calls-socketcall, ipc and clone-were fairly difficult to implement as they involved the obvious differentiators between Linux and Unix: networking, inter-process communication and kernel threads. -- Planet Earth - a subsidiary of Microsoft®. We have no bugs in our software, Never!, We do have undocumented added features, that you will find amusing, at no added cost, to you, at this time.