Technical stuff

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Across
  1. 2. the device used to scroll and click on a computer is called what?
  2. 3. the screen is also refered to as the?
  3. 4. Who invented apple?
  4. 5. the device used to type words on a computer is called what?
  5. 7. who founded the microsoft company?
  6. 10. who uses the IOS system on thier products?
Down
  1. 1. you cant have a computer without a...
  2. 3. the main part of a computer is always what?
  3. 6. this crossword is for Mr.____?
  4. 8. what part of the computer protects the internal parts of the computer?
  5. 9. in terms of computers, what is the abbreviation for computer processing unit?