Английский язык

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Англ с Информатик

Cursor control keys include arrow keys that move the inser-

tion point up, down, right and left, and keys such as End, Home,

Page Up and Page Down, which are used in word processing to

move around a long document.

Alphanumeric keys represent letters and numbers, as ar-

ranged on a typewriter.

Function keys appear at the top of the keyboard and can be

programmed to do special tasks.

Dedicated keys are used to issue commands or produce alter-

native characters. For example: Ctrl changes the functions of other

keys [e.g. Ctrl + X cuts the selected text). Caps Lock sets the key-

board in “CAPITALS” mode; it only affects letters. Enter (or Re-

turn) is pressed to select options from a menu or to start a new par-

agraph.

Backspace deletes the character to the left of your current po-

sition.

A numeric keypad appears to the right of the main keyboard.

The Num Lock key is used to switch from numbers to editing

keys.

The Mouse

A mouse is a hand-held device that lets you move a pointer or

a cursor and select items on the screen. It has one or more buttons

to communicate with the PC. A scroll wheel lets you move

through your documents or web pages. The pointer looks like an I-

bar, an arrow or a pointing hand.

An optical mouse has an optical sensor instead of a ball un-

derneath. A cordless (wireless) mouse has no cable: it sends data

via infrared signals or radio waves. Mouse actions:

– to click, press and release the left button;

– to double-click, press and release the left button twice;

– to drag, hold down the button, move the pointer to a new

place and then release the button;

– to right-click, press and release the right button; this action

displays a list of commands.

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