Welcome to the Pronto Addiction.
This will explain the question you have about buttons on the home page. [Link: remotecentral.com]
There may be other interesting stuff you might want to know in the FAQ as well.
To program this remote, I recommend TouchScreenSetup from the files section or Tonto from [Link: giantlaser.com]
The FAQ has information about Serial to USB converters should you be in the position to not have an RS232 port available on your PC.