Thanks for the reply. IO::Socket::INET was actually one of the first packages I tried (and I tried a lot of them...), but my Mac would systematically deny opening a socket. Sure I could have configured it to go around that but I thought I could find another solution than a network protocol that can always be blocked by some firewall or similar program.
Just to add a little bit of context since it doesn't seem to be clear in my first post, this program I'm writing is meant to be used by anyone without special configuration (if possible).

In reply to Re^3: Shared memory and asynchronous access by vef445
in thread Shared memory and asynchronous access by vef445

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