Internet and computing

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Across
  1. 4. You have to fill it in in order to get in your account
  2. 5. The biggest information system in the world
  3. 7. Internet mail
  4. 8. Internet sites run on these
Down
  1. 1. Digital circuit which performs operations on some external data source
  2. 2. Two symbols language used by computers
  3. 3. Detects and then removes viruses from computer
  4. 6. Unit of digital information