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Implemention, originally written for the Python Idle IDE

For security reasons, GvR requested that Idle's Python execution
server process
connect to the Idle process, which listens for the connection.  Since Idle
has
only one client per server, this was not a limitation.

   +---------------------------------+ +-------------+
   | SocketServer.BaseRequestHandler | | SocketIO    |
   +---------------------------------+ +-------------+
                   ^                   | register()  |
                   |                   | unregister()|
                   |                   +-------------+
                   |                      ^  ^
                   |                      |  |
                   | + -------------------+  |
                   | |                       |
   +-------------------------+        +-----------------+
   | RPCHandler              |        | RPCClient       |
   | [attribute of RPCServer]|        |                 |
   +-------------------------+        +-----------------+

The RPCServer handler class is expected to provide register/unregister
methods.
RPCHandler inherits the mix-in class SocketIO, which provides these
methods.

See the Idle run.main() docstring for further information on how this was
accomplished in Idle.

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