- (void)startUp {
  // Arbitrary port number for starting the service. Ensure that this doesn't
  // conflict with any existing ports being used.
  UInt16 portNumber = 12345;

  // The root object exposed is associated with a dispatch queue, any invocation made
  // on this object will have its invocations forwarded to the host. The invocations
  // will be dispatched to the associated queue.
  FooClass *rootObject = [[FooClass alloc] init];
  // If the execution queue is released, the EDOHostService running in this
  // queue will be released as well. Users can choose their own way to
  // retain the queue.
  self.executionQueue = dispatch_queue_create("MyQueue", DISPATCH_QUEUE_SERIAL);
  [EDOHostService serviceWithPort:portNumber
                       rootObject:rootObject
                            queue:self.executionQueue];
}

# FooClass.h

@interface FooClass
- (void)method1;
@end

# FooClass.m omitted [Present only in the Host Process, containing the implementation of method1]

- (void)someMethod {
  // The object, fetched remotely from the host is seen by the client to be the same as a local
  // object.
  FooClass *rootObject = [EDOClientService rootObjectWithPort:portNumber];
  [rootObject method1];
}