Operating instructions

system unit The main component of the PC in which the CPU, RAM,
CD-ROM,and hard drive reside. All other devices like the keyboard, mouse, and
monitor connect to the system unit.
Tablet PC A small portable computer distinguished by the use of a touch
screen with stylus and handwriting recognition as the primary mode of input.
Also the name of the Windows operating system designed to run on such
systems.
Task Manager The Task Manager shows all running programs, including
hidden ones. You access the Task Manager by pressing
CTRL-ALT-DEL. You can
use it to shut down an unresponsive application that refuses to close normally.
taskbar Located by default at the bottom of the desktop, the taskbar contains
the Start button, the system tray, the Quick Launch bar, and buttons for running
applications.
TCP (Transmission Control Protocol) Part of the TCP/IP protocol suite, TCP
operates at Layer 4 (the Transport layer) of the OSI seven-layer model. TCP is a
connection-oriented protocol.
TCP/IP (Transmission Control Protocol/Internet Protocol) Asetofcommu-
nication protocols developed by the U.S. Department of Defense that enables
dissimilar computers to share information over a network.
TCP/IP services A set of special sharing functions unique to TCP/IP. The
most famous is Hypertext Transfer Protocol (HTTP), the language of the World
Wide Web. Telnet and Ping are two other widely-used TCP/IP services.
tera- A prefix that usually stands for the binary number 1,099,511,627,776
(2
40
). When used for mass storage, often shorthand usage for a trillion bytes.
terabyte 1,099,551,627,776 bytes.
terminal A dumb” device connected to a mainframe or computer network
that acts as a point for entry or retrieval of information.
terminal emulation Software that enables a PC to communicate with another
computer or network as if the PC were a specific type of hardware terminal.
termination The use of terminating resistors to prevent packet reflection on a
network cable.
66 MIKE MEYERS A+ CERTIFICATION PASSPORT
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
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