Message Passing The most basic mechanism provided by the operating system Message passing basically allows a process to send stream of bytes to another process. Message passing system works as follows: 1. The receiving process requests the OS to create a port (or mailbox), where incoming messages are stored. 2. Each port has a unique system-wide address, which is assigned, when the port is created. 3. Then the receiving process may choose to register the port address with a directory service. 3
