The Touchstone Self-study Audio CD/CD-ROM, included in the back of the Student's Book, provides extra practice with listening, speaking, and vocabulary.
You can run the program off the disc without first installing it. But where possible, we recommend that you install the program. After you install it, you don't need to put the disc into your CD-ROM drive to use the program. Also, if you install the program, you can add new expressions, notes, and examples to "My Vocabulary Notebook."
For complete installation instructions see the readme file on the CD-ROM.