18. The computer readable medium of claim 17 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.
17. 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: storing user data which has been retrieved from the first client computer system into a user database 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.