X.25 is a standard that defines the communications protocol for access to packet-switched networks.
What is an ISO and ITU standard for addressing and transporting e-mail messages. It conforms to layer 7 of the OSI model and supports several types of transport mechanisms, including Ethernet, X.25, TCP/IP, and dial-up lines.
The X.500 is the standard for defining a distributed directory service standard and was developed by the International Standards Organization (ISO). This ISO and ITU standard defines how global directories should be structured. X.500 directories are hierarchical, which means that they have different levels for each category of information, such as country, state, and city. X.500 supports X.400 systems.
X Windows is a standard set of display-handling routines developed at MIT for UNIX workstations. These routines are used to create hardware-independent graphical user interfaces for UNIX systems.
eXtensible Markup Language. A formal method to create common information formats thator shares both the format and the data.
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