Input and output devices NE

3. to press and release the left button twice
5. it is an input device that captures photographs in digital memory
10. the act of clicking on one icon and moving it on top of another icon to initiate a specific action
11. a measure of the sharpness of an image (in dpi)
13. a special type of printer which uses ink and fine pens held in a carriage to draw detailed designs on paper
14. they let you send and receive live video pictures through the Internet
16. the viewing area, it is measured diagonally
18. it is a peripheral that reads images and converts them into electronic codes which can be understood by a computer
19. Sometimes referred to as digital imaging; the act of translating an image, a sound, or a video clip into digital format for use on a computer
20. it sets the keyboard in 'CAPITALS' mode
21. a series of black and white stripes used to give products a unique identification number

1. it is a stationary device that works like a mouse turned upside down
2. it is built like a photocopier and is for use on a desktop
4. it is the output and optical device that presents visual contents like moving or stationary images on the screen
6. it is a typesetting printer that generates very high-resolution output on paper or microfilm
7. it is found on notebook PCs. You use it by pressing the sensitive pad with a finger
8. a handheld device used with a graphical user interface system
9. powdered ink used in laser printers
12. it is mainly applied in controlling the movement of characters in video games. It is also employed in the cockpit of an airplane
15. it is an inbuilt voice input device in which different sounds can be collected in their digital form
17. it looks like a pen, you can scan text, figures, barcodes and handwritten numbers with it
20. include 'arrow keys' which move the insertion point, and keys such as Home, End, Page Up, etc.