At present, one of the latest computing technologies that seem to change the view of the modern world is mobile Internet. Now wireless applications are more popular among the users and the organizations. This book aimed to investigate on various technologies that are used to provide Internet facilities on a mobile phone, and to develop a dynamic WAP (Wireless Application Protocol) application for a library system. The book discusses the major technologies which are important to understand mobile Internet environment, such as mobile computing, wireless communication channels, wireless network protocols and different technologies that can be used to develop a WAP application such as WML (Wireless Markup Language), Java Servlet, DBMS (Database Management System), Apache Tomcat server etc. The application was implemented on mobile phone emulator from which user can reserve a book, renew a book and send a request to librarian’s email address. The book also describes the stages of SDLC (System Development Life Cycle) for the application. This book will provide theoretical and practical help to the students and software developers who are interested in developing WAP applications.