Fast way to send message between 2 child processes? (using a file is too slow?)

[Christian Seberino]

process1_tuple = os.popen4("some code1")

process2_tuple = os.popen4("some code2")

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What is fast way to send a message between process1 and process2??

process2 cannot just write to STDIN of process1  because he doesn't
have a reference to process1.  (process2 does not have process1_tuple)

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The only way I could think to do this was to write and read from a file but this
is SLOW.

Is there another way **without using a file**??

Thanks!

Chris