File descriptors can be passed between processes using the sendmsg() API.
If you have further questions about that, I'd suggest taking this
question to darwin-dev.
Here's some links:
http://devworld.apple.com/qa/qa2007/qa1541.html
http://topiks.org/mac-os-x/0321278542/ch09lev1sec11.html
http://books.google.com/books?id=K8vUkpOXhN4C&lpg=PA1149&ots=OJmfXVYvYy&dq=sendmsg%20descriptor%20passing%20%22os%20x%22&pg=PA1149#v=onepage&q=sendmsg%20descriptor%20passing%20%22os%20x%22&f=false
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