operating system

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Across
  1. 3. OS (alternatively SYSTEM or OPERATING) 1. Software that runs between the hardware and user programs (2 words, 6 & 2 letters)
  2. 4. 3. Services like file management, device handling, and security (8)
  3. 5. 5. Different periods or stages of OS development (10)
  4. 7. Mechanisms used by programs to request services from the OS (8)
  5. 8. The initial program that starts the operating system (4)
  6. 10. DRIVER 6. Part of OS that controls hardware devices (6, 6 letters)
Down
  1. 1. (short for utilities, or SYSTEM programs if 6 letters) 2. Programs that help manage files, edit text, and compile code (6)
  2. 2. Guarding the system against unauthorized access (10)
  3. 6. The way the OS is organized or built (9)
  4. 9. 4. Operating system categories like batch, time-sharing, real-time (5)