Dell OptiPlex GX50 User Manual page 255

COA
Certificate of Authenticity. The Microsoft Windows COA is a 25-digit alpha-
numeric code located on a sticker on your computer. You need the COA to
complete the OS setup or reinstallation. Also referred to as the Product Key
or Product ID. For more information, see http://support.dell.com.
COM Port
A shortened reference to communications port. The typical designation for a
serial connection to a modem or other serial device. Most computers support
one or two serial connectors designated as COM1 and COM2.
Control Code
An I/O character that causes an action rather than appears as part of the data.
You can input most control codes by simultaneously pressing the <Ctrl>
key and a letter or character on the keyboard. Some control codes usually have
their own assigned keys, such as <Escape>, <Tab>, <Delete>,
<Backspace>, and <Enter>. Different OSs and programs have their own
conventions for what effect certain control codes will have, such as
interrupting the current process or suspending output. Control codes can also
be used to affect an output device, such as causing a printer to start a new
line of text.
Controller
Part of a computer, typically a separate circuit board or chip, that allows the
computer to use certain kinds of devices. Types of controllers include hard-
drive, network, keyboard, interrupt, and graphics controllers.
COO
Cost of ownership. Business asset data that helps an organization collect and
track information about its assets. COO data is contained in a file on a
computer, defining the fiscal aspects of the computer, such as ownership
status, warranty information, lease configuration, acquisition information,
and so on. The computer is a technology investment, and COO business asset
data provides organizations with information they can use to target the
reduction of maintenance and support costs, as well as to assist system
integrators track the cost of computers they provide for their customers.
CPU
Central processing unit. A computer chip that interprets and executes
program instructions. Also referred to as the microprocessor.
CRIMM
Continuity Rambus in-line memory module (RIMM). Module that provides
electrical continuity through the Rambus channel when the channel is not
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