Depending on your computer, but going to control panel on a Windows computer can change the brightness, and backgrounds.
I dont think it would be possible for someone to listen to your calls im pretty sure only the police could if they provide a sign warrent by a judge to the phone company
This isn't related to computers and when you look it up all it comes up with a Stars Wars.
The answer to your question is b crowding out effect
Your answer is true your welcome!
