Process to process synchronization (unix)

[Gillou]

Hi,

I have a Zope application and another running process (in python too).
I need to transmit data and signal (hey ! data available, do your job !) in
an asynchronous way from the Zope app (in an external method) to the python
running process (that runs for another user).
The other process waits for the signal, takes given data, does the jobs and
waits further signal (...)
I'm 99.9% newbie in process to process communication.
What packages are helpful for this ?
Any examples ?

Thanks in advance.

--Gillou