| Pen-based which main input device is an electronic pen.
A personal digital assistant or PDA is a tiny computer which
can be held in one hand. The term PDA refers to a wide variety of
hand-held devices, palmtops and pocket PCs.
For input, you type at a small keyboard or use a stylus – a spe-
cial pen used with a touch screen to select items, draw pictures,
etc. Some models incorporate handwriting recognition, which ena-
bles a PDA to recognize characters written by hand. Some PDAs
recognize spoken words by using voice recognition software.
They can be used as mobile phones or as personal organizers
for storing notes, reminders and addresses. They also let you ac-
cess the Internet via wireless technology. Without cables.
Note that the term PC usually refers to an IBM compatible
personal computer i.e. an Apple Mac personal computer is not re-
ferred to as a PC. A computer that provides a service on a network
e.g. storing files, sharing a printer, is known as a server computer.
Server computers usually have a UPS (uninterruptible power sup-
ply) attached to them. This is a battery that automatically provides
30
an electricity supply to allow the server to shut itself down proper-
ly if the main supply fails.
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