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4.7 What is different about Emacs 20?

The differences between Emacs versions 18 and 19 were rather dramatic; the introduction of frames, faces, and colors on windowing systems was obvious to even the most casual user.

There are differences between Emacs versions 19 and 20 as well, but many are more subtle or harder to find. Among the changes are the inclusion of MULE code for languages that use non-Latin characters and for mixing several languages in the same document; the “Customize” facility for modifying variables without having to use Lisp; and automatic conversion of files from Macintosh, Microsoft, and Unix platforms.