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Message: [QUOTE="exarkun, post: 3946451"] Since, as you point out below, there is only one thread, the remote methods can only be invoked one at a time. However, rather central to the asynchronous operation of Twisted libraries and applications, the remote method itself may return before the remote call has been completely serviced. So while only one remote method will run at a time, each of the two remote calls may run concurrently at some point before they are responded to. It isn't possible. While the remote methods are running, other events are not being serviced. This is what is meant when people describe Twisted as a "*cooperative* multitasking" system. Event handlers (such as remote methods) run for a short enough period of time that it doesn't matter that the reactor is prevented from accepting new connections (or what have you) for the duration of their execution. Jean-Paul [/QUOTE]