index_X

X

X.25 networks, 52, 120123, 439

X.25 packets, 52, 53

X.25 technology, 120121

X.400 messaging, 260263, 400

X.500 standard, 255256, 357358

XML (Extensible Markup Language), 263268, 418419

XNS (Xerox Network System) protocol, 12, 13,

XSL (Extensible Stylesheet Language), 263268