XNSIDP - Xerox® Network Services Internet Datagram Protocol
XNU - X's Not Unix
XOFF - eXchange OFF
XOM - X/open Object Management
XON - eXchange ON
XORP - eXtensible Open Router Project
XOSL - eXtended Operating System Loader
XOT - X.25 Over TCP/IP
XP - eXPerience
XP - eXtreme Programming
XPC - X Performance Characterization
XPC - X.25 Protocol Controller
XPCOM - Cross-Platform Component Object Model
XPDS - Xerox® Print Data Streams
XPFE - Cross-Platform Front End
XPG - X.400 Promotion Group
XPG - X/open Portability Guide
XPGR3 - X/open Portability Guide Release 3
XPM - X PixMap
XPRL - eXtensible Public Relations Language
XPS - eXPert System
XPS - eXtended Parallel Server
XPS - Xilinx Platform Studio
XPSB - X-Protocol Stream Benchmark
XPT - eXternal Page Table
XQL - XML Query Language
XRC - Extended Remote Copy
XRF - eXtended Recovery Facility
XRI - eXtensible Resource Identifier
XRIP - eXtended Routing Information Protocol
XRL - eXchangeable Routing Language
XRL - eXtra Requirement List
XrML - eXtensible rights Markup Language
XRML - eXtensible Rule Markup Language
XRN - eXpandable Resilient Networking
XRPM - eXtensible Resource Provisioning Management
xRPM - xApp Resource and Program Management
XRT - eXtensions for Real-Time market data
XSCS - XML Schema Compact Syntax
XSD - eXtra Space Design
XSD - XML Schema Definition
XSEM - XML Scripture Encoding Model
XSI - eXtended Service Interface
XSIL - eXtensible Scientific Interchange Language
XSL - eXtensible Stylesheet Language
XSLT - eXtensible Stylesheet Language Transformations
XSMD - eXtended Storage Module Driver
XSS - Cross-Site Scripting
XSS - XyLoc Security Server
XSTF - XML Structure Task Force
XT - eXtended Technology
XTACACS - eXtended Terminal Access Controller Access Control System
XTI - X/Open Transport Interface
XTML - eXtensible Telephony Markup Language
XTND - XML Transition Network Definition
XTP - eXpress Transport Protocol
XTT - XML Tunneling Technology
XUI - X-windows User Interface
XUIDL - X-Unique-ID-Listing
XUL - XML-based User interface Language
xVIP - xApp Visual Information for Plants
XVRL - eXtensible Value Resolution Language
XVT - eXecutive Vector Table
XWD - X Window Dump
XWPC - eXtended Wireless PC
XWSF - XML Web Services Framework
XWSF - XSLT Web Services Framework