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+<!DOCTYPE doctype PUBLIC "-//w3c//dtd html 4.0 transitional//en">
+<html>
+<head>
+  <meta http-equiv="Content-Type"
+ content="text/html; charset=ISO-8859-1">
+  <meta name="GENERATOR"
+ content="Mozilla/4.78 [en] (X11; U; Linux 2.4.7-10 i686) [Netscape]">
+  <title>Story of SAOImage DS9</title>
+</head>
+<body link="#0000ee" text="#000000" vlink="#551a8b" alink="#ff0000"
+ bgcolor="#ffffff">
+<h3> <img alt="" src="sun.gif" height="98" width="100" align="middle">
+The Story of SAOImage DS9: How DS9 got its name<br>
+</h3>
+<blockquote>
+  <p>In 1990, Mike Van Hilst, at the Smithsonian Astrophysical
+Observatory, Center for Astrophysics, Harvard University, developed
+SAOImage. SAOImage was first implemented in X10, then reimplemented in
+X11. In fact, it was one of the first X11 based applications publicly
+made available. SAOImage was a brilliant program, implementing
+techniques in scientific visualization 20 years ago that are still
+being used by today's applications. Since Mike's departure from SAO,
+SAOImage has been maintained by Doug Mink.</p>
+  <p>In the mid 1990's, with the administrative support of Steve
+Murray, Eric Mandel developed SAOtng, or
+(SAOImage, The Next Generation), named after the Star Trek series. TNG
+was based on IRAF's XIMTOOL graphics libraries and Tcl. It explored new
+GUI interfaces and supported a new external analysis interface. In
+particular, it utilized XPA, (X11 Public Access, also written by Eric)
+which allowed TNG to be scripted via a shell, or from other application.</p>
+  <p>In 1998, while working with Eric, William Joye began a complete
+rewrite of TNG, based on the experience developed while supporting TNG.
+This project was funded by the NASA Applied Information Systems
+Research Program, under the title "Future Directions for Astronomical
+Image Display". For lack of a name, the new project was referred to as
+DS9, the logical extension of the Star Trek series. The name continues
+to be in use. Current funding is provided by the NASA High Energy
+Astrophysics Science Archive Center and the Chandra X-ray Science
+Center.<br>
+  </p>
+  <p>DS9 is a Tcl/Tk application. The GUI is implemented as a very thin
+layer of Tk. A number of Tk Canvas widgets in C++ were created to
+support all the functionality needed. Basically, all the real work is
+done in C++. DS9 inherited TNG's support of regions, XPA, external
+analysis support, and the general GUI. However, all the visualization
+techniques come directly from SAOImage.</p>
+  <p>The current version of DS9 is composed of the Tk widgets created
+along with support from about 20 other open source products (including
+Tcl/Tk, AST, BLT, HCompress, HTMLWidget, plio, rics, tcllib, tclxml,
+tkcon, tkimg, tktable, wcssubs, xmlrpc, XPA, zip, zlib, and zvfs). The
+distributed binaries consist of a self-contained self-extracting
+archive and application, which provides an independent Tcl/Tk
+environment without installation.</p>
+  <p>The first versions of SAOImage DS9 were made available in 1999.
+Since then, the popularity of DS9 has grown far beyond expectations.<br>
+  </p>
+</blockquote>
+</body>
+</html>