They are here
You can use the println() command to log information here
A signal can be triggered when the sketch is going switch, around 5 seconds before ending. Click here to simulate that signal. Check the examples.
Your sketch can interact with people's phone. They will have a basic interaction, just a one-button interface. When you click here you will send signals to your sketch. Check the examples.
here we should put some tips from last help.html file