intrinsic challenge when building middleware such as this requires a combination of expertise from fields such as distributed systems, networks, software engineering, and application development. This book provides a comprehensive introduction to the major underlying issues, technology, paradigms, and solutions to the attention of developers of middleware for mobile environment. The material has been successfully used in several thematic training school organized by MiNEMA FEE (Middleware for Network Eccentric and Mobile Applications) program, and organization and presentation of books is ideal for an advanced course in middleware.