Operating system functions

3. Main functions of an operating system

The operating system performs many important tasks, such as:

• starting and shutting down the computer or device,
• managing programs and apps,
• managing memory,
• coordinating tasks,
• configuring devices,
• establishing an Internet connection,
• providing file management,
• updating the operating system software,
• monitoring security,
• controlling network access.

Simple understanding:

The OS makes sure the computer works in an organized, efficient, and secure way.

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4. The role of the OS when using a computer

When you use a computer to do work, the OS helps you:

• start a word processing program,
• open a file,
• add information to the document,
• save the file,
• store the file location so you can access it later.

Example:

When you open Microsoft Word and type an assignment:

• the OS runs the program,
• the OS manages memory,
• the OS helps save the file to storage.

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5. User interface

The operating system provides ways for users to interact with the computer.

Important terms:

GUI (Graphical User Interface)
A visual way of interacting with a device using icons, buttons, menus, and images.

Icon
A small picture that represents a program, file, or command.

Button
A graphic you click to perform a command.

Menu
A list of related commands or options.

Submenu
A list of additional commands connected to a selected menu item.

Shortcut menu
A list of commonly used commands related to an object.

Dialog box
A box that shows options or asks for input from the user.

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6. Controls in a dialog box

A dialog box may contain:

• Option buttons (radio buttons)
  Allow the user to choose one option only.
• Check boxes
  Allow a yes/no choice.
• List boxes
  Show a list of options for selection.

Example:

In print settings:

• choose page orientation using an option button,
• choose black-and-white printing using a check box,
• choose paper size from a list box.