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Glossary of Computer Terms Print


XYZ: - Return to Index

X - Refers to X-Windows.

X11 - Refers to X-Windows.

X.21 - Is the CCITT description for the Physical Layer.

X.25 - Refers to the CCITT standard for Packet Switched Networks.

X.400 - Refers to the CCITT standard for Electronic Mail.

XML - Refers to eXtensible Markup Language or Extensible Markup Language.

XOR - See Exclusive OR.

xterm or x-term - Is an X-Windows terminal or the emulation mode of an X-Windows terminal.

X-Windows - Is a GUI operating system enhancement for Unix/Linux and BSD based OSes.

Y - Return to Index

Y2K - Refers to the Year 2000. It is often associated with a computer software problem frequently referred to as the Y2K bug. This is the inability of software to recognize dates greater than December 31, 1999.

Yellow Book - Refers to a ISO 9660 compliant CD-ROM format using mode 1 addressing. Compact discs utilizing this format can be played on the majority of CD-drives. This is the industry standard format for the majority of multimedia programs developed for the PC.

YMODEM - Refers to a file transfer protocol developed by Chuck Forsberg and is most commonly used between modems. It is a successor to XMODEM and has lead to the development of ZMODEM. Y-MODEM is a batch protocol and can use up to 1-kilobyte packets.

YMODEM-G - Is a streaming derivative of YMODEM engineered for errorless connections. This protocol allows for the transmitter to send packets to the receiver as fast as possible by, much like UDP, not waiting for ACKs. Errors in the transmission will cause the entire file transfer to halt.

yo-yo list - See Stack.

YP - Refers to Yellow Pages.
Z - Return to Index

Zero Assignment Langauge - Refers to a language consiting entirely of functions and no variables.

ZIF - Refers to Zero Insertion Force; a term used to describe a specific socket for Intel® Pentium chips.

Z-Index Property or Z Index Property - Refers to defining the stackable order of elements.

ZMODEM - Refers to a batch file transfer protocol with resume and error checking developed by Chuck Forsberg. This protocol does not wait for ACKs after each packet is sent, but instead it streams the data like YMODEM-G. Since this protocol supports resume, a transfer interupted in transit can pick up where it left off. This is the most preferred protocol for sending files to and from BBSes that do not support the TCP/IP FTP protocol.