Note: 

To run Working Model, the CD-ROM from the book must be
in your CD drive at all times.

Working Model 5.2 Textbook Edition
Students may build and test new mechanisms with the WM Textbook Edition. 
Note: The WM Textbook Edition does not allow users to save or print.
Instructors may call 800-766-6615 or 650-381-3395 for information on how
to expand the capabilities of their current software for classroom use.
For more information on available editions, visit www.workingmodel.com.
For information on printing high-quality pictures from WM, follow the
instructions at www.workingmodel.com/faqlist.html#print).