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| | UNIX systems are "Open" |
 | | Because UNIX systems communicate through industry-standard TCP/IP communication protocols, and use an industry-standard interface based on an X-Windows and Motif graphical environment, and share disk drives through the use of industry-standard NFS technology, they are called "open systems". |
 | | UNIX operating systems typically start with source code that is now licensed by Novell, Inc. Novell's UNIX Systems Group licenses the actual UNIX source code to vendors such as IBM, Hewlett-Packard, Sun Microsystems, SCO (Santa Cruz Operation), and many others. |
 | | This sharing of technology between UNIX vendors is in stark contrast to other vendors operating systems, which are labeled "proprietary". |
| www.devdaily.com /unix/edu/UnixSysAdmin/node11.shtml (180 words) |
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