Upon consulting my java network programming book... it appears there is something called RMI (Remote Method Invocation) which apparently allows a program to access methods of objects across the wire. And something else called CORBA which lets objects written in different languages communicate with each other.
This is definately beyond the scope for an introduction to OOP, or even an introduction to whatever programming language you plan on using (and actually CORBA is beyond the scope of my book too).
Perhaps you should go to the library and see if they have any books that explain it properly
