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@pitrou
You can just delete my original post. I'll repost an edited version here for reference
original post with paths removed:
This is an issue for me (Python 3.2). I have a custom pool that sends arguments for a function call over a pipe. I cannot send another pipe as an argument. 
Tim's workaround also does not work for me (win xp 32bit and 64bit)
From what I can tell, you can only send a connection as a direct argument to a function call. This limits what I can do because I cannot introduce new pipes to a worker process after it is instantiated.
Using this code:
def main():
 from multiprocessing import Pipe, reduction
 i, o = Pipe()
 print(i);
 reduced = reduction.reduce_connection(i)
 print(reduced);
 newi = reduced[0](*reduced[1])
 print(newi);
 newi.send("hi")
 o.recv()
if __name__ == "__main__":
 main();
This is my output:
<read-write PipeConnection, handle 1760>
(<function rebuild_connection at 0x00FD4C00>, (('\\\\.\\pipe\\pyc-3156-1-q5wwnr', 1756, False), True, True))
<read-write Connection, handle 1720>
>>> newi.send("hi")
IOError: [Errno 10038] An operation was attempted on something that is not a socket
As you can see, the handle changes