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+.TL
+Preface to the Third (2000) Edition
+.LP
+A great deal has happened to Plan 9 in the five years since its last release.
+Although much of the system will seem familiar, hardly any aspect
+of it is unchanged.
+The kernel has been heavily reworked;
+the graphical environment completely rewritten;
+many commands added, deleted, or replaced;
+and the libraries greatly expanded.
+Underneath, though, the same approach to computing remains:
+a distributed system that uses file-like naming to access and
+control resources both local and remote.
+.LP
+Some of the changes are sweeping:
+.IP
+Alef is gone, a casualty of the cost of maintaining multiple languages, compilers,
+and libraries in a diverse world,
+but its model for processes, tasks, and communication lives on
+in a new thread library for C.
+.IP
+Support for color displays is much more general, building on a new
+alpha-blending graphical operator called
+.CW draw
+that replaces the old
+.CW bitblt .
+Plan 9 screens are now, discreetly, colorful.
+.IP
+A new mechanism called plumbing connects applications together
+in a variety of ways, most obviously in the support of multimedia.
+.IP
+The interfaces to the panoply of rotating storage devices have been
+unified and extended,
+while providing better support for having Plan 9 coexist with other
+operating systems on a single disk.
+.IP
+Perhaps most important, this release of the system is being done under
+an open source agreement, providing cost-free source-level access to the
+software.
+.LP
+Plan 9 continues to be the work of many people.
+Besides those mentioned in the old preface,
+these people deserve particular note:
+Russ Cox did much of the work updating the graphics
+and creating the new disk and bootstrap model
+as well as providing a number of new commands;
+David Hogan ported Plan 9 to the Dec Alpha;
+and
+Sape Mullender wrote the new thread library.
+.LP
+Other new contributors include
+Bruce Ellis,
+Charles Forsyth,
+Eric Van Hensbergen,
+and
+Tad Hunt.
+.sp
+.in 3i
+Bell Labs
+.br
+Computing Science Research Center
+.br
+Murray Hill NJ
+.br
+June, 2000