This paper defines the problem space of distributed, migratable and plastic user interfaces, and presents CAMELEON-RT, a technical
answer to the problem. CAMELEON-RT1 is an architecture reference model that can be used for comparing and reasoning about existing tools as well as for developing
future run time infrastructures for distributed, migratable, and plastic user interfaces. We have developed an early implementation
of a run time infrastructure based on the precepts of CAMELEON-RT.