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1. You can't use RMI to talk to an application written in another language.
2. You can use RMI/IIOP to talk to an application written in another language if:
(a) the other application speaks CORBA
(b) the other application is a CORBA client
(c) your Java application is a CORBA server.
3. If you can't meet those constraints, you would have to use Sockets directly with a home-grown protocol (be careful about word order, alignment, packing, slack bytes, etc), or XML-RPC, or SOAP, or some other high-level industry standard protocol.