The use of computer

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Across
  1. 3. Key combination for pasting text (5 letters, abbreviation)
  2. 4. A saved collection of information on a computer (4 letters)
  3. 6. A type of system software that manages computer hardware (9 letters)
Down
  1. 1. The main unit that processes data in a computer (9 letters)
  2. 2. The program used to view websites (7 letters)
  3. 5. Key combination for copying text (5 letters, abbreviation)