................ is a Windows utility programme that locates and eliminates unnecessary fragments and rearranges files and unused disk space to optimise operations. 

Which of the following refers to the rectangular area for displaying information and running programmes?

A (n) ................ appearing on a web page opens another document when clicked.

................ is the most important/powerful computer in a typical network. 

The CPU comprises of Control, Memory, and ------ units. 

To display the contents of a folder in Windows Explorer you should