A handler can be anything from calling a method on an object, running a command or invoking a remote object call.

事件处理器可以做任何事，包括调用一个对象的方法，运行一个命令，或者对远程对象进行调用。

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Each method provides a callback object so that you are notified asynchronously when the remote procedure call is complete.

每个方法都提供了一个回调对象，这样就可以在完成远程过程调用后收到异步通知。

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To summarize, the ORB pass by reference option basically treats the invoked EJB method as a local call (even for EJBs with remote interfaces) and avoids the requisite object copy.

总的来说，OR B通过引用传递选项基本上将调用的EJB方法作为本地调用对待(甚至对于带远程接口的EJB)，并避免必需的对象复制操作。

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