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| n | direct
addressing: |
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| u | when a specific
process identifier is used for |
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| source/destination |
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| u | but it might be
impossible to specify the |
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| source ahead of
time (ex: a print server) |
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| n | indirect
addressing (more convenient): |
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| u | messages are
sent to a shared mailbox which |
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| consists of a
queue of messages |
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| u | senders place
messages in the mailbox, |
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| receivers pick
them up |
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