From Apple: Macintosh Management Server 1.2 is the Mac OS X Server process used to manage Mac OS client computers. The Macintosh Management Server 1.2 Installer updates your Macintosh Management Server software to version 1.2. To use this software, you need version 1.2 or later of the Macintosh Manager administration software and version 1.1 or later of the Macintosh Manager client software installed on your Mac OS computers. Do not use this version of the server with versions of Macintosh Manager client software earlier than 1.1.
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