<span>Virus is the answer.
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To pair with another device such as a speaker you would use the Bluetooth feature to link the two devices together, also known as pairing.
The use of <span>different control features in the design of the user interface are : </span>Menu bar - displays the main options at the top of the screen.
Toolbar - contains icons that represent shortcuts for executing common commands.
Command button - start an action such as printing a form or requesting Help.
Dialog box - allows a user to enter information about a task that the system will perform.
Text box - display messages or provide a place for a user to enter data.
Toggle button - is used to represent on or off status — clicking the toggle button switches to the other status.
List box - displays a list of choices that the user can select.
Scroll bar - allows the user to move through the available choices.
Drop-down list box - displays the current selection; when the user clicks the arrow, a list of the available choices displays.
Option button - represent groups of options. The user can select only one option at a time; selected options contain a black dot.
Answer:
General purpose computers are designed to be able to perform variety of tasks when loaded with appropriate programs, while special purpose computers are designed to accomplish a single task.