Hi, I suggest you study the user guide. These questions are answered there.
Moderator comment: telling to read the guide WITHOUT giving actual URL to specific part of it is pretty much useless. If you instruct people to read, give them the URL.
@hernandj yes you can do all of those things. As for #2, the output can be many different things depending on what you want. You can code the output to produce a "Buy" or "Sell" signal in a Scan or Exploration or Backtest. You can produce an "Alert", you can produce a signal on a Chart, you can generate an email, etc etc.
AmiBroker is a powerful program and you can probably do more than your imagination can produce.