Explain operating system functions
Relate file, memory, device, user, security and multitasking management to the operating system's role.
Section 4 · Software
Exam scope and assessment notes
This sequence follows Cambridge IGCSE Computer Science 0984, 2026–2028 syllabus Version 4. It covers subject content sections 4.1–4.2 only. The separately published 2029–2031 syllabus is not mapped here. Practice is original, self-checked and does not award an official Cambridge grade. Full timed papers and human subject-teacher review remain outstanding. Cambridge states that 0984 has the same 2026–2028 subject content as 0478, with 9–1 grading. In June and November, Cambridge lists 0984 in Administrative zone 3 and for centres in Oman and the UAE. Confirm availability for your centre and exam series with Cambridge International. The separately published 2029–2031 syllabus changes to Python 3 only and removes pseudocode; this 2026–2028 route does not cover those changes.
Before you begin
- No programming language is required. Be comfortable with place value and multiplication; each lesson introduces the computer-science notation it uses.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
What does an operating system provide between the user and computer resources?
What you will learn
- Describe common operating system services
- Explain how drivers and interfaces help users and hardware
- Apply OS functions to a situation
The operating system manages shared resources
An operating system manages files and memory, provides a user interface, manages peripherals through drivers, supports multitasking and supplies a platform for applications.
Apply and check the rule
It also handles interrupts, manages system security and user accounts, and coordinates access to hardware. These functions let applications use the computer without each application having to control every device directly.
Pause and explain
Which OS function helps several applications make progress?
Worked example
A printer is connected and a document is opened while music is playing. Name two OS functions involved.
Show the worked solution
- A printer driver helps the operating system communicate with the peripheral.
- The OS manages the document file and application platform.
- Multitasking shares processor time between the document and music application.
Answer The OS manages the printer through its driver and supports multitasking between the document and music applications.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
A user creates a new account with a password. Which operating-system responsibilities are involved?
Give me a hint
Think about accounts and security.
Compare my reasoning
- The OS manages the user account.
- It can apply access and security controls to the account.
Managing user accounts and system security.
Look for these in your work
- Account function identified
- Security connection
A mouse is connected but the application cannot interpret its movement. Which OS service may be missing or faulty?
Give me a hint
The OS needs a component that communicates with the peripheral.
Compare my reasoning
- The mouse is a peripheral.
- A device driver helps the OS manage and communicate with it.
- A missing or faulty driver can prevent normal use.
Peripheral and device-driver management.
Look for these in your work
- Peripheral recognized
- Driver role
- Fault applied
A computer runs a browser, a music player and a backup task. Explain how the OS supports this and why each application need not control the CPU directly.
Give me a hint
Connect multitasking with managed hardware access.
Compare my reasoning
- The OS manages multitasking and schedules use of processor resources.
- It provides a platform and interfaces to memory and devices.
- Applications request services through the OS instead of independently controlling all hardware.
The OS coordinates multitasking and resource access, providing a common platform so programs can run without each one managing the CPU and devices directly.
Look for these in your work
- Multitasking stated
- Resource management stated
- Abstraction explained
Common mistakes
- Saying the operating system is the printer driver
- Assuming multitasking means two programs use one CPU instruction at exactly the same instant
What can you explain now?
Which OS function manages access to connected peripherals?
Compare with the explanation
Managing peripherals and drivers
Device drivers provide the interface between the operating system and hardware.
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Make it stick
Name four operating system functions from the syllabus list.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.