- Signals: which are used to indicate that an event has occurred.
- Shared memory: permits processes to communicate by simply reading and writing to a specified memory location.
- Pipes: permit sequential communication from one process to a related process.
- FIFOs: are similar to pipes, except that unrelated processes can communicate because the pipe is given a name in the filesystem.
- Sockets: support communication between unrelated processes even on different computers
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