We present our results of the conceptual design and the implementation of 
ubiquitous computing applications using smart identification technologies. 
First, we describe such technologies and their potential application areas, 
then give an overview of some of the applications we have developed. Based on 
the experience we have gained from developing these systems, we point out 
design concepts that we have found useful for structuring and implementing 
such applications. Building upon these concepts, we have created two 
frameworks based on Jini (i.e., distributed Java objects) and Web Services to 
support the development of ubiquitous computing applications that make use of 
smart identification technology. We describe our prototype frameworks, 
discuss the underlying concepts and present some lessons learned.