2.2.2
The Computer
When users interact with computers, they are either passing information to other people, or re-
ceiving information from them. Therefore, in term of the computer science, interaction is a pr
o-cess of information transfer, from the user to the computer and from the computer to the user.
A computer system comprises various elements, each of which affects differently to the user of the
system. Among those components, there are two important mechanisms which are widely
applied
in every computer systems.