11. A computer readable medium useful in association with a computer which includes a processor and a memory, the computer readable medium including computer instructions which are configured to cause the computer to migrate a user from (i) a first client computer system coupled through a computer network to a server computer system to (ii) a second client computer system coupled through the computer network to the server computer system by performing the steps of retrieving data files associated with the user from the first client computer system; marking the user as not registered within the first client computer system; storing the retrieved data files within the second client computer system; marking the user as registered within the second client computer system; querying the server computer system regarding the status of the user; and restricting access by the user to the second client computer system pending receipt of data representing the status of the user from the server computer system.
14. The computer readable medium of claim 11 wherein the step of marking the user as registered comprises: forming a new user registration record which represented registration of the user in the second client computer system; and storing the new user registration record within a registration database of the second client computer system.