There is a bit of an example in http://twistedmatrix.com/documents/current/core/howto/process.html but I'm sure somebody out there must have fleshed this out into a more complete implementation. Can anybody point me to such a thing, before we write out own? We are currently using GnuPGInterface.py, but its non-twisted child process handling is causing flakyness, especially around the waitpid() call. Thanks, Sam