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Across
  1. 2. displayed in a new web browser window that opens above browser window
  2. 5. displayed in a new web browser window that opens under browser window
  3. 6. Many modern worms install a ... , that allows the spammer to access the computer
  4. 9. advertising-supported software
Down
  1. 1. practice of sending unwanted email messages
  2. 3. To prevent something from passing by using a filter; filter something out
  3. 4. unwanted
  4. 7. a program that blocks ads in your browser
  5. 8. graphical ads displayed within a web page