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<p>to associate X with Unix, X servers also exist natively within other graphical environments. VMS Software Inc.'s OpenVMS operating system includes a version of X with Common Desktop Environment (CDE), known as DECwindows, as its standard desktop environment.  Apple originally ported X to macOS in the form of X11.app, but that has been deprecated in favor of the <a href="page.php?w=XQuartz">XQuartz</a> implementation. Third-party servers under Apple's older operating systems in the 1990s, System 7, and <a href="page.php?w=classic_Mac_OS">Mac OS</a></p><p>
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