For several decades, people have been using computer networks to interconnect personal computers and servers in companies, colleges, and cities. An evolution has been taking place, however, toward using networks wirelessly. In fact, today wireless interfaces are available to utilize network services that allow us to use e-mail and access applications, and browse the Internet from just about anywhere.
These wireless applications are enabling people to extend their workplace in a way that results in significant benefits. Business travelers, for example, are able to respond to e-mails while waiting for a flight at an airport. A homeowner can easily share a common Internet connection among multiple PCs and laptops without running cabling. This book explains the underlying technologies that make these types of applications possible.