"David Chisnall takes a look at the GNU Project's infamous HURD kernel, exploring some of the features that make it unique and some that have found their way into other systems. [...] Even in its current state, HURD exists to prove a point: It’s possible to have a complete and usable system running nothing other than GNU code." -- http://www.informit.com/articles/printerfriendly.aspx?p=1180992
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