BlitzIn is a Windows program that shows you a chess board and lets to play on the ICC.
To get BlitzIn:
Download the BlitzIn installer.
Run the downloaded file. This will install BlitzIn on your computer.
Connect to the Internet and run BlitzIn. The BlitzIn icon is the ICC logo.
If you have not registered on the ICC, you can click the link by "Get a FREE trial of ICC!" to create an account. Otherwise, enter your ICC name and password, click the "Sign In" button.