In a client-server model that is implemented by using a simple RPC mechanism, after making an RPC request, a client keeps waiting until a reply is received from the server for its request. It would be more efficient to allow the client to perform other jobs while the server is processing its request (especially when the request processing time is long). Describe the mechanism that may be used in this case to allow a client to perform other jobs while the server is processing its request.

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