Named Pipes ? XML-RPC ? Standard Input-Output ? Web Services ?
I would not use unsafe stuff like Shared Memory and similar
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Named pipes would be the fastest method,
but it only works for communication between processes on the same computer. Named pipes communication doesn’t go all the way down the network stack (because it only works for communication on the same computer) so it will always be faster.Anonymous Pipes may only be used on the local machine. However, Named Pipes may traverse the network.
I left out Shared Memory since you specifically mentioned that you don’t want to go that route. Shared Memory would be even faster than named pipes tho.
So it depends if you only need to communicate between processes on the same computer or different computers. Any XML-based communication protocol (eg. Web Services) will usually be slower due to the massive overhead in XML.