Another process can not read or write to data of your process. read perlipc. Basicly your tasks can share a special memory area or they talk via pipes. This is not a limitation/feature of perl its your os.
Boris
Comment on Re: acessing pointer data from the memory
No, I understand it that way, that he embed a perl interpreter, that may share with tghe cpp application. But also start scripts, external to the application. The scripts should share something with the cpp application where perl is embedded. Maybe I get it wrong.