We believe that wireless data services and Mobile VPN in particular have a great potential to not only improve business productivity and give services providers new revenue opportunities, but also offers significant improvements in our everyday lives. The successful deployment of com-plex third-generation wireless data systems and services like Mobile VPNs will entirely rest on the shoulders of thousand of professionals in the fields of wireless and data communications, as well as the next generation of engineers and managers completing their studies. With their help, new and exciting products will be rolled out by equipment manufacturers and new services will be offered by operators. We hope this book will help this group in both understanding of the technology and its application and practical deployment to bring the progress in wireless communication to a new level and continue the remarkable run it has enjoyed for the last two decades.
After all, unlike Alice and the Cheshire cat, we believe that it does matter which way you choose. There are many forks on the road of wireless communications and we hope that this book will not only help the readers to decide where they want to go, but also guide them through many difficult turns.