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This section describes how messages are composed, sent and received within the Mach IPC system.
| • Mach Message Call: | Sending and receiving messages. | |
| • Message Format: | The format of Mach messages. | |
| • Exchanging Port Rights: | Sending and receiving port rights. | |
| • Memory: | Passing memory regions in messages. | |
| • Message Send: | Sending messages. | |
| • Message Receive: | Receiving messages. | |
| • Atomicity: | Atomicity of port rights. |