- Messages are directed and received from mailboxes (also referred to as ports).
- Each mailbox has a unique id.
- Processes can communicate only if they share a mailbox.
- Properties of communication link
- Link established only if processes share a common mailbox
- A link may be associated with many processes.
- Each pair of processes may share several communication links.
- Link may be unidirectional or bi-directional.
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