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X
X Window UNIX Graphics User Interface
X.25
X86 processor
xBASE Programming
xDSL Network
Xeon Processor
Xerox PARC Xerox Palo Alto Research Center
XML Extensible Markup Language
XMS Extended Memory Specification
XON Communication
XPath XML 路徑語言（XML Path）
XQuery XML 查詢語言（XML Query）
XSLT Extensible Stylesheet Language for Transformations
