This guide is vendor, programming language and carrier/service operator compatible. It discusses principles of wireless application design and best practices in the development of WAP services. Emerging WAP technologies such as location-based services, XML push technology, end-to-end security and XHTML are also discussed. The book also contains a complete description of wireless handhelds, competing WAP gateways and the inter-operability concerns for developing in worldwide markets. The CD-ROM includes all the examples from the book, as well as a collection of WAP SDKs from various providers.