HP 3000 Manuals

IPC Using File System Intrinsics [ Interprocess Communication:Programmer's Guide ] MPE/iX 5.0 Documentation

Interprocess Communication:Programmer's Guide

Chapter 3  IPC Using File System Intrinsics 

There are several ways processes can communicate under MPE XL. The most
powerful is the IPC facility provided by the file system.

MPE/iX 5.0 Documentation