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copied!<p>The possibility that comes immediately to mind is to use a broadcast datagram that contains a close message and the process id of the one that you want closed. Each of the console processes listens for broadcast datagrams on a common port. When the program receives a datagram, it parses the data, checks the passed process id against its own process id, and if they match, the program initiates a clean shutdown.</p> <p>This assumes, of course, that you have created a way for the program to shut itself down cleanly.</p> <p>Broadcast datagrams aren't guaranteed to be received, of course, but my experience has been that they're reliable on a single system. If you run into a problem, you could have your main program send the datagram, wait some period of time to see if the program has shut down, and if not then send the datagram again.</p> <p>Another possibility is to create a named <code>EventWaitHandle</code> for each process that you start, passing the name of that event to the console application on the command line. The console program could then have a thread that does a <code>WaitOne</code> on that event. When the event is set, the program initiates a clean shutdown. This is more reliable than the broadcast datagram. Sure, it uses another handle per process, but that won't be a problem unless you have thousands of processes.</p> <p>See <a href="https://stackoverflow.com/questions/480430/send-message-from-one-running-console-app-to-another/480707#480707">Send message from one running console app to another</a> for an example of using a named wait handle to communicate between processes.</p>

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