There are several ways. Using shared memory seems to obvious choice. Alternatively, you can translate the array to a string, pass the string from on program to another (pipe, file, fifo, socket), make an array of that again, do your calculations, stringify it again, pass it back over some channel, and turn it into an array again. You could use Data::Dumper for the string/array translations.

I'd redesign the setup and make sure I wouldn't need to pass arrays from one program to the other. But I'm funny that way.

Abigail