Seamless connectivity to multiple wireless networks independently of a fixed point is becoming increasingly important for mobile devices but portable multimedia devices such as PDA's with restricted memory and smart phones vary greatly and all these devices require optimal multimedia delivery. This book presents an extensible middleware which caters for resource constrained devices to full-fledged computers through dynamic micro-protocols which enable devices to adopt specific protocol stacks at runtime in an attempt to optimise the stack to the functionality that is actually required by the application.