The short version
1) Create an interface. (in this case, the interface is myRMIInterface.java).
2) Create a class that implements the interface. (in this case, myRMIImpl.java).
3) Create a server that creates an instance of this class
4) Create a client that connects to the server object using Naming.lookup()
5) Compile these classes.
6) Run the RMI interface compiler on the .class file of the implementation
class (in this case, you’d say “rmic myRMIImpl”).
7) Start the RMI registry (on Windows NT/95, say “start rmiregistry”).
8) Start the server class (“start java myRMIServer”).
9) Run the client program (“java myRMIClient”).

The long version: http://patriot.net/~tvalesky/easyrmi.html